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76-469: The SD24 was the first EMD production locomotive to be built with an EMD turbocharged diesel engine. The first SD24 was built sixteen months before the four-axle ( B-B ) model GP20 . Power output of the SD24 was 33 percent higher than the 1,800 hp (1,340 kW) of the concurrent Roots blower -equipped SD18s with the same engine displacement . The SD24 has 400 hp (298 kW) per axle, limited by

152-406: A compressor in the turbocharger pressurises the intake air before it enters the inlet manifold . In the case of a turbocharger, the compressor is powered by the kinetic energy of the engine's exhaust gases, which is extracted by the turbocharger's turbine . The main components of the turbocharger are: The turbine section (also called the "hot side" or "exhaust side" of the turbo) is where

228-433: A 1,200-US-gallon (1,000 imp gal; 4,500 L) capacity, while 2,400-or-3,000-US-gallon (2,000 or 2,500 imp gal; 9,100 or 11,400 L) tanks were optional. In practice, all SD24s ordered had the 3,000-US-gallon (2,500 imp gal; 11,000 L) tank except for the last built, Kennecott Copper 's single locomotive. In order to provide room for a larger fuel tank, the air reservoirs were relocated on

304-548: A bill in the U.S. House of Representatives authorizing a land grant to the company to construct a line from the mouth of the Ohio River to Chicago and on to Galena . Federal support, however, was not approved until 1850, when U.S. President Millard Fillmore signed a land grant for the construction of the railroad. The Illinois Central was the first land-grant railroad in the United States. The Illinois Central

380-970: A condition known as diesel engine runaway . Illinois Central Gulf Railroad The Illinois Central Railroad ( reporting mark IC ), sometimes called the Main Line of Mid-America , was a railroad in the Central United States . Its primary routes connected Chicago , Illinois, with New Orleans, Louisiana , and Mobile, Alabama , and thus, the Great Lakes to the Gulf of Mexico . Another line connected Chicago west to Sioux City, Iowa (1870), while smaller branches reached Omaha, Nebraska (1899) from Fort Dodge, Iowa , and Sioux Falls, South Dakota (1877), from Cherokee, Iowa . The IC also ran service to Miami , Florida, on trackage owned by other railroads. The IC, founded in 1851, pioneered

456-522: A folk anthem, " City of New Orleans " about riding on Illinois Central's "Monday-morning rail" train and the passing of the "magic carpet" ride of passenger rail service in the United States, which once dominated travel. The IC was one of the oldest Class I railroads in the United States. The company was incorporated by the Illinois General Assembly on January 16, 1836. Within a few months Rep. Zadok Casey (D-Illinois) introduced

532-460: A lower boost threshold, and greater efficiency at higher engine speeds. The benefit of variable-geometry turbochargers is that the optimum aspect ratio at low engine speeds is very different from that at high engine speeds. An electrically-assisted turbocharger combines a traditional exhaust-powered turbine with an electric motor, in order to reduce turbo lag. This differs from an electric supercharger , which solely uses an electric motor to power

608-544: A modification as #423, but it was refitted with a 16-645 engine, AR10 alternator and Dash Two electrical cabinet in May 1974, making it effectively an EMD SD40-2 . This was a testbed for a proposed upgrade of all UP's SD24s, but UP decided not to go ahead with the work. Both UP 3100 and UP 414 were classified as "SD24m" by the UP, but some UP internal documents class UP 414 as a "SD24-4". Several high-nose Southern SD24s were rebuilt by

684-512: A ring of holes or circular grooves allows air to bleed around the compressor blades. Ported shroud designs can have greater resistance to compressor surge and can improve the efficiency of the compressor wheel. The center hub rotating assembly (CHRA) houses the shaft that connects the turbine to the compressor. A lighter shaft can help reduce turbo lag. The CHRA also contains a bearing to allow this shaft to rotate at high speeds with minimal friction. Some CHRAs are water-cooled and have pipes for

760-415: A series were offered with turbocharging (e.g., the 38 sub-models within the 40 Series were Roots-blown). Optional equipment that could be specified by ordering railroads included multiple unit controls, a steam generator , dynamic brakes , winterization equipment, an air signal line, and hump control. Despite the options the vast majority were similar in configuration. The standard fuel tank offered

836-637: A turbocharger was in June 1924 when the first heavy duty turbocharger, model VT402, was delivered from the Baden works of Brown, Boveri & Cie , under the supervision of Alfred Büchi, to SLM, Swiss Locomotive and Machine Works in Winterthur. This was followed very closely in 1925, when Alfred Büchi successfully installed turbochargers on ten-cylinder diesel engines, increasing the power output from 1,300 to 1,860 kilowatts (1,750 to 2,500 hp). This engine

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912-474: Is increasing. The companies which manufacture the most turbochargers in Europe and the U.S. are Garrett Motion (formerly Honeywell), BorgWarner and Mitsubishi Turbocharger . Turbocharger failures and resultant high exhaust temperatures are among the causes of car fires. Failure of the seals will cause oil to leak into the cylinders causing blue-gray smoke. In diesel engines, this can cause an overspeed,

988-759: Is not sufficient exhaust heat energy to drive the turbine fast enough for the compressor to supply the air necessary for combustion, the engine drives the compressor through a gear train and an overrunning clutch. At higher power levels, the overrunning clutch is disengaged, and the turbo-compressor operates as a true turbocharger. It is possible for the turbo-compressor to revert to compressor mode momentarily during commands for large increases in engine power. Turbocharging provides higher horsepower and good running characteristics at all altitudes. Turbocharging also improves fuel consumption and reduces emissions. Previous Union Pacific experiments with turbocharging had utilized multiple Elliot or Garrett AiResearch turbochargers feeding

1064-407: Is powered by the flow of exhaust gases. It uses this energy to compress the intake air, forcing more air into the engine in order to produce more power for a given displacement . The current categorisation is that a turbocharger is powered by the kinetic energy of the exhaust gases, whereas a supercharger is mechanically powered (usually by a belt from the engine's crankshaft). However, up until

1140-453: Is too large, the turbo will fail to create boost at low speeds; if the aspect ratio is too small, the turbo will choke the engine at high speeds, leading to high exhaust manifold pressures, high pumping losses, and ultimately lower power output. By altering the geometry of the turbine housing as the engine accelerates, the turbo's aspect ratio can be maintained at its optimum. Because of this, variable-geometry turbochargers often have reduced lag,

1216-441: Is unable to produce significant boost. At low rpm, the exhaust gas flow rate is unable to spin the turbine sufficiently. The boost threshold causes delays in the power delivery at low rpm (since the unboosted engine must accelerate the vehicle to increase the rpm above the boost threshold), while turbo lag causes delay in the power delivery at higher rpm. Some engines use multiple turbochargers, usually to reduce turbo lag, increase

1292-569: The City of New Orleans and the Illini and Saluki between Chicago and Carbondale. Another Illinois corridor service is planned for the former Black Hawk route between Chicago, Rockford and Dubuque. Amtrak, at the state of Illinois' request, did a feasibility study to reinstate the Black Hawk route to Rockford and Dubuque. Initial capital costs range from $ 32 million to $ 55 million, depending on

1368-951: The Chicago & Illinois Midland , the Wisconsin Southern (WSOR), the Iowa Interstate (IAIS), and the Indiana Harbor Belt . These units are slowly being retired, with the IAIS and WSOR having completely removed them from their rosters. The IHB has only 3 left, and the CIM (now the Illinois Midland ) retains only 1 of their 5. From January 1973 through January 1978 the Atchison, Topeka and Santa Fe Railway rebuilt its fleet of eighty SD24 locomotives, naming

1444-701: The Consolidated B-24 Liberator , Lockheed P-38 Lightning , Republic P-47 Thunderbolt and experimental variants of the Focke-Wulf Fw 190 . The first practical application for trucks was realized by Swiss truck manufacturing company Saurer in the 1930s. BXD and BZD engines were manufactured with optional turbocharging from 1931 onwards. The Swiss industry played a pioneering role with turbocharging engines as witnessed by Sulzer, Saurer and Brown, Boveri & Cie . Automobile manufacturers began research into turbocharged engines during

1520-589: The Duluth, Missabe & Iron Range Railway would want to start purchasing the SD24 and sent the first demonstrator to the DMIR painted in the road's livery. The DMIR did not end up purchasing the SD24 and the demonstrator went to the Union Pacific Railroad . The turbocharger was the then-new EMD mechanically assisted turbo-compressor. During engine startup, and at lower power levels, during which there

1596-639: The Illinois Central Gulf Railroad ( reporting mark ICG ). October 30 of that year saw the Illinois Central Gulf commuter rail crash , the company's deadliest. At the end of 1980, ICG operated 8,366 miles of railroad on 13,532 miles of track; that year it reported 33,276 million ton-miles of revenue freight and 323 million passenger-miles. Later in that decade, the railroad spun off most of its east–west lines and many of its redundant north–south lines, including much of

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1672-590: The Memphis and Charleston Railroad at Grand Junction, Tennessee and the Mobile and Ohio Railroad at Jackson, Tennessee. The Mississippi Central was the scene of several military actions from 1862 to 1863 and was severely damaged during the fighting. Company president, Absolom M. West succeeded in repairing the damage and returning it to operating condition soon after the end of the War. By 1874, interchange traffic with

1748-476: The Milwaukee Road and Morrison Knudsen for Precision National's lease fleet in 1979. The turbochargers and dynamic brakes were removed, and Precision gave them class SD10. In 1980 more followed, though they were low-nose units of Union Pacific origin. In 1982 the Chicago & North Western bought 22 of the high-nose and four of the low-nose units. Producing 1,800 horsepower (1,340 kW) (without

1824-563: The National Advisory Committee for Aeronautics (NACA) and Sanford Alexander Moss showed that a turbocharger could enable an engine to avoid any power loss (compared with the power produced at sea level) at an altitude of up to 4,250 m (13,944 ft) above sea level. The testing was conducted at Pikes Peak in the United States using the Liberty L-12 aircraft engine. The first commercial application of

1900-698: The Panama Limited, the Electric District appears as "Panama Orange" on Metra system maps and timetables. Additionally, the IC operated a second commuter line out of Chicago (the West Line ) which served Chicago's western suburbs. Unlike the electrified commuter service, the West Line did not generate much traffic and was eliminated in 1931. Amtrak presently runs three trains daily over this route,

1976-413: The crankshaft ) whereas a turbocharger is powered by the kinetic energy of the engine's exhaust gas . A turbocharger does not place a direct mechanical load on the engine, although turbochargers place exhaust back pressure on engines, increasing pumping losses. Supercharged engines are common in applications where throttle response is a key concern, and supercharged engines are less likely to heat soak

2052-418: The turbocharger ), they were designated model SD18R - not to be confused with actual SD18 locomotives as manufactured by General Motors Electro-Motive Division . At least two SD24s survive in museums: Turbocharger#Marine and land-based diesel turbochargers In an internal combustion engine , a turbocharger (also known as a turbo or a turbosupercharger ) is a forced induction device that

2128-614: The "Pearl and Leaf Rivers Railroad" was built by the J.J. Newman Lumber Company from Hattiesburg , to Sumrall . In 1904 the name was changed to the Mississippi Central Railroad ( reporting mark MSC ). In 1906 the Natchez and Eastern Railway was formed to build a rail line from Natchez to Brookhaven . In 1909 this line was absorbed by the Mississippi Central. For a short time during the 1920s,

2204-484: The "torpedo tube" air reservoirs further back on the long hood, and gave the SD26 a noticeable "hump-backed" appearance. One unit was wrecked, 44 were traded to EMD in 1985 and 35 were sold to Guilford Rail System in 1986. All have since been scrapped. The Union Pacific Railroad modified three SD24 locomotives experimentally to see if it would be worthwhile to upgrade their fleet of 30 such locomotives. Unit 410 received

2280-510: The 1880s, northern lines were built to Dodgeville, Wisconsin ; Sioux Falls, South Dakota ; and Omaha, Nebraska . Further expansion continued into the early twentieth century. The Illinois Central, and the other "Harriman lines" owned by E.H. Harriman by the twentieth century, became the target of the Illinois Central shopmen's strike of 1911 . Although marked by violence and sabotage in the southern, midwestern, and western states,

2356-511: The 1950s, however the problems of "turbo lag" and the bulky size of the turbocharger were not able to be solved at the time. The first turbocharged cars were the short-lived Chevrolet Corvair Monza and the Oldsmobile Jetfire , both introduced in 1962. Greater adoption of turbocharging in passenger cars began in the 1980s, as a way to increase the performance of smaller displacement engines. Like other forced induction devices,

EMD SD24 - Misplaced Pages Continue

2432-820: The EMD SD24B, the EMD SD7 , and the EMD SD35 ) to 2000 horsepower roadswitchers powered by EMD 645E prime movers, resulting in the EMD SD20 . All units had the electricals upgraded to Dash 2 technology, and the turbocharger was removed on the SD24s and SD35s. 35 of the 42 SD20s built were rebuilt from either the SD24 or the SD24B. Illinois Central, the successor to the ICG, retired them in 1995. They later found work on shortlines such as

2508-633: The Illinois Central Railroad was important enough that the IC installed a Nutter hoist at Cairo, Illinois to interchange between its standard gauge equipment broad gauge used by the Mississippi Central. This allowed the trucks to be exchanged on 16-18 freight cars per hour; a Pullman car could be changed in 15 minutes. The original Mississippi Central line was merged into the Illinois Central Railroad subsidiary Chicago, St. Louis and New Orleans Railroad in several transactions finally completed in 1878. A line started in 1897 as

2584-545: The United States. The original Mississippi Central line was chartered in 1852. Construction of the 255 miles (410 km) 5 ft ( 1,524 mm ) gauge line began in 1853 and was completed in 1860, just prior to the Civil War , from Canton, Mississippi to Jackson, Tennessee . The southern terminus of the line connected to the New Orleans, Jackson and Great Northern Railroad at Canton. It also connected to

2660-475: The aim of overcoming the power loss experienced by aircraft engines due to the decreased density of air at high altitudes. However, the prototype was not reliable and did not reach production. Another early patent for turbochargers was applied for in 1916 by French steam turbine inventor Auguste Rateau , for their intended use on the Renault engines used by French fighter planes. Separately, testing in 1917 by

2736-406: The benefits of both small turbines and large turbines. Large diesel engines often use a single-stage axial inflow turbine instead of a radial turbine. A twin-scroll turbocharger uses two separate exhaust gas inlets, to make use of the pulses in the flow of the exhaust gasses from each cylinder. In a standard (single-scroll) turbocharger, the exhaust gas from all cylinders is combined and enters

2812-421: The compressor wheel. Large turbines typically require higher exhaust gas flow rates, therefore increasing turbo lag and increasing the boost threshold. Small turbines can produce boost quickly and at lower flow rates, since it has lower rotational inertia, but can be a limiting factor in the peak power produced by the engine. Various technologies, as described in the following sections, are often aimed at combining

2888-419: The compressor. The compressor draws in outside air through the engine's intake system, pressurises it, then feeds it into the combustion chambers (via the inlet manifold ). The compressor section of the turbocharger consists of an impeller, a diffuser, and a volute housing. The operating characteristics of a compressor are described by the compressor map . Some turbochargers use a "ported shroud", whereby

2964-413: The effective aspect ratio of the turbocharger as operating conditions change. This is done with the use of adjustable vanes located inside the turbine housing between the inlet and turbine, which affect flow of gases towards the turbine. Some variable-geometry turbochargers use a rotary electric actuator to open and close the vanes, while others use a pneumatic actuator . If the turbine's aspect ratio

3040-433: The end of 1970, IC operated 6,761 miles of road and 11,159 of track. In 1960, the railroad retired its last steam locomotive, 2-8-2 Mikado #1518. On August 31, 1962, the railroad was incorporated as Illinois Central Industries, Inc. ICI acquired Abex Corporation (formerly American Brake Shoe and Foundry Co.) in 1968. On August 10, 1972, the Illinois Central Railroad merged with the Gulf, Mobile and Ohio Railroad to form

3116-403: The engine rpm is within the turbocharger's operating range – that occurs between pressing the throttle and the turbocharger spooling up to provide boost pressure. This delay is due to the increasing exhaust gas flow (after the throttle is suddenly opened) taking time to spin up the turbine to speeds where boost is produced. The effect of turbo lag is reduced throttle response , in

EMD SD24 - Misplaced Pages Continue

3192-559: The engine's coolant to flow through. One reason for water cooling is to protect the turbocharger's lubricating oil from overheating. The simplest type of turbocharger is the free floating turbocharger. This system would be able to achieve maximum boost at maximum engine revs and full throttle, however additional components are needed to produce an engine that is driveable in a range of load and rpm conditions. Additional components that are commonly used in conjunction with turbochargers are: Turbo lag refers to delay – when

3268-482: The exhaust gases, minimizes parasitic back losses and improves responsiveness at low engine speeds. Another common feature of twin-scroll turbochargers is that the two nozzles are different sizes: the smaller nozzle is installed at a steeper angle and is used for low-rpm response, while the larger nozzle is less angled and optimised for times when high outputs are required. Variable-geometry turbochargers (also known as variable-nozzle turbochargers ) are used to alter

3344-420: The factory had a pronounced downward slope of the top towards the nose, as did those of the contemporary GP20. Many of the high short hood units had their noses chopped later on, often as a consequence of rebuilding; these as a rule have flat-topped short hoods. As the SD24 locomotives aged, they began to develop reliability problems, especially electrical ones. In addition, the extra maintenance requirements of

3420-416: The financing later used by several long distance U.S. railroads whose construction was partially financed through a federal land grant . The Canadian National Railway , via Grand Trunk Corporation , acquired control of the IC in 1998, and absorbed its operations the following year. The Illinois Central Railroad maintains its corporate existence as a non-operating subsidiary. In 1971, Steve Goodman released

3496-404: The form of a delay in the power delivery. Superchargers do not suffer from turbo lag because the compressor mechanism is driven directly by the engine. Methods to reduce turbo lag include: A similar phenomenon that is often mistaken for turbo lag is the boost threshold . This is where the engine speed (rpm) is currently below the operating range of the turbocharger system, therefore the engine

3572-425: The former GM&O. Most of these lines were bought by other railroads, including entirely new railroads such as the Chicago, Missouri and Western Railway ; Paducah and Louisville Railway ; Chicago Central and Pacific Railroad ; and MidSouth Rail Corporation . In 1988, the railroad's parent company, IC Industries, spun off its remaining rail assets and changed its name to Whitman Corporation. On February 29, 1988,

3648-405: The gas flow through the turbine section, and the turbine itself can spin at speeds of up to 250,000 rpm. Some turbocharger designs are available with multiple turbine housing options, allowing a housing to be selected to best suit the engine's characteristics and the performance requirements. A turbocharger's performance is closely tied to its size, and the relative sizes of the turbine wheel and

3724-502: The intake air. A combination of an exhaust-driven turbocharger and an engine-driven supercharger can mitigate the weaknesses of both. This technique is called twincharging . Turbochargers have been used in the following applications: In 2017, 27% of vehicles sold in the US were turbocharged. In Europe 67% of all vehicles were turbocharged in 2014. Historically, more than 90% of turbochargers were diesel, however, adoption in petrol engines

3800-530: The line operated a service named "The Natchez Route", running trains from Natchez to Mobile, Alabama through trackage agreements with the Gulf, Mobile and Northern Railroad . At Natchez, freight cars were ferried across the Mississippi River to connect with the Louisiana and Arkansas Railway to institute through traffic into Shreveport, Louisiana . In 1967 the property of the Mississippi Central

3876-714: The main route including The Creole and The Louisiane . The Green Diamond was the Illinois Central's premier train between Chicago, Springfield and St. Louis. Other important trains included the Hawkeye which ran daily between Chicago and Sioux City and the City of Miami eventually running every other day between Chicago and Miami via the Atlantic Coast Line , the Central of Georgia Railroad and Florida East Coast Railway . The Illinois Central

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3952-431: The mid-20th century, a turbocharger was called a "turbosupercharger" and was considered a type of supercharger. Prior to the invention of the turbocharger, forced induction was only possible using mechanically-powered superchargers . Use of superchargers began in 1878, when several supercharged two-stroke gas engines were built using a design by Scottish engineer Dugald Clerk . Then in 1885, Gottlieb Daimler patented

4028-508: The most minor modification: upgraded air filters. UP 423, however, was substantially rebuilt to UP 3100 in August 1968 with a constant-speed 16-645 3,000 hp (2,240 kW) prime mover, a new alternator and new traction motors. With the constant-speed engine, speed control was via changing the level of excitation of the alternator; the traction motors were permanently wired in parallel. New, variable dynamic brakes were also fitted, as

4104-466: The newly separated ICG dropped the "Gulf" from its name and again became the Illinois Central Railroad. On February 11, 1998, the IC was purchased for about $ 2.4 billion in cash and shares by Canadian National Railway (CN). Integration of operations began July 1, 1999. Illinois Central was the major carrier of passengers on its Chicago-to-New Orleans mainline and between Chicago and St. Louis. IC also ran passengers on its Chicago-to-Omaha line, though it

4180-581: The operation of the train, the Illinois Central combined the Panama Limited with a coach-only train called the Magnolia Star . On May 1, 1971, Amtrak took over intercity rail service. It retained service over the IC mainline, but dropped the Panama Limited in favor of the City of New Orleans. However, since it did not connect with any other trains in either New Orleans or Chicago, Amtrak moved

4256-460: The oral examination before admitting them to the Illinois bar), as a trustee on the new railroad's board to guard the public's interest. Lockwood, who would serve more than two decades until his death, had overseen federal land monies shortly after Illinois' statehood, then helped oversee early construction of the recently completed Illinois and Michigan Canal . Upon its completion in 1856, the IC

4332-452: The present-day shore to the east. Track from Centralia north to Freeport would be abandoned in the 1980s, as traffic to Galena was routed via Chicago. In 1867, the Illinois Central extended its track into Iowa . During the 1870s and 1880s, the IC acquired and expanded railroads in the southern United States. IC lines crisscrossed the state of Mississippi and went as far south as New Orleans, Louisiana , and east to Louisville, Kentucky . In

4408-399: The range of rpm where boost is produced, or simplify the layout of the intake/exhaust system. The most common arrangement is twin turbochargers, however triple-turbo or quad-turbo arrangements have been occasionally used in production cars. The key difference between a turbocharger and a supercharger is that a supercharger is mechanically driven by the engine (often through a belt connected to

4484-462: The resulting type the SD26 . The rebuild boosted the power output of the locomotives by upgrading the 16-567D3 engines with EMD 645 power assemblies . Other work improved the reliability by replacing the entire electrical systems, and replacing the multiple body-side vents with a central air filtration system. The large box fitted high on the body behind the cab for the air filters required relocating

4560-485: The roof just behind the locomotive's cab . The tanks were known as " torpedo tubes " due to their long, thin design. Winterization included a winterization hatch over one of the radiator fans, to direct warm air back into the engine compartment. Either a low or high short hood could be ordered; in either case, the short hood was front by default. The Burlington, Southern and first EMD demonstrator had high short hoods; all others were low short hood. Low short hoods from

4636-436: The rotational force is produced, in order to power the compressor (via a rotating shaft through the center of a turbo). After the exhaust has spun the turbine it continues into the exhaust piping and out of the vehicle. The turbine uses a series of blades to convert kinetic energy from the flow of exhaust gases to mechanical energy of a rotating shaft (which is used to power the compressor section). The turbine housings direct

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4712-509: The route to an overnight schedule and brought back the Panama Limited name. However, it restored the City of New Orleans name in 1981, while retaining the overnight schedule. This was to capitalize on the popularity of a song about the train written by Steve Goodman and performed by Arlo Guthrie . Willie Nelson 's recording of the song was #1 on the Hot Country Charts in 1984. Illinois Central ran several other trains along

4788-460: The route. Once in operation, the service would require roughly $ 5 million a year in subsidies from the state. On December 10, 2010, IDOT announced the route choice for the resumption of service to begin in 2014 going over mostly CN railway. Presidents of the Illinois Central Railroad have included: Several locomotives and rolling stock formerly owned and used by Illinois Central are preserved, and many of them reside in parks and museums across

4864-569: The strike was effectively over in a few months. The railroads simply hired replacements, among them African-American strikebreakers, and withstood diminishing union pressure. The strike was eventually called off in 1915. The totals above do not include the Waterloo RR, Batesville Southwestern, Peabody Short Line or CofG and its subsidiaries. On December 31, 1925, IC/Y&MV/G&SI operated 6,562 route-miles on 11,030 miles of track; A&V and VS&P added 330 route-miles and 491 track-miles. At

4940-400: The technique of using a gear-driven pump to force air into an internal combustion engine. The 1905 patent by Alfred Büchi , a Swiss engineer working at Sulzer is often considered the birth of the turbocharger. This patent was for a compound radial engine with an exhaust-driven axial flow turbine and compressor mounted on a common shaft. The first prototype was finished in 1915 with

5016-584: The traction motors available. Nevertheless, the turbocharged SD24 provides full rated power at all altitudes, which the Roots-blown SD18 could not provide. In terms of sales, the SD24 was only a moderate success, and had average service lives in SD24 configuration (though a few deturbocharged rebuilds are still in operation), but the SD24 was a milestone in EMD locomotive development and the forerunner to today's high-powered six-axle locomotives. EMD thought

5092-461: The turbocharged engine were acceptable when they were some of the most powerful locomotives available, but in secondary service, they were an expensive way to get 2,400 hp (1,800 kW). Thus, a large number of SD24s were rebuilt by various owners to extend their lives. From August 1979 through December 1982, the Illinois Central Gulf Railroad rebuilt various C-C locomotives (the EMD SD24,

5168-500: The turbocharger via a single intake, which causes the gas pulses from each cylinder to interfere with each other. For a twin-scroll turbocharger, the cylinders are split into two groups in order to maximize the pulses. The exhaust manifold keeps the gases from these two groups of cylinders separated, then they travel through two separate spiral chambers ("scrolls") before entering the turbine housing via two separate nozzles. The scavenging effect of these gas pulses recovers more energy from

5244-527: The usual pair of Roots blowers. EMD's mechanically assisted turbocharger eliminated the need for the pair of Roots blowers and also integrated the turbocharging function from two (Elliot) or four (AiResearch) smaller add-on turbochargers into one much larger, turbo-compressor (turbocharger) with intercooling. The introduction of the EMD-type turbocharger was successful and all subsequent SD series were offered with this turbocharger, although not all models within

5320-438: Was a self load feature enabling testing under load without an external electrical load apparatus. This latter feature became standard on later locomotive models. The constant-speed prime mover, on the other hand, was not successful enough to duplicate. From 1975, the locomotive was used as a heavy switcher at UP's North Platte, Nebraska hump yards , a fate common to UP's other surviving SD24s. UP 414 did not receive as major

5396-579: Was also a major operator of commuter trains in the Chicago area, operating what eventually became the "IC Electric" line from Randolph Street Terminal in downtown Chicago to the southeast suburbs. In 1987, IC sold this line to Metra , who operates it as the Metra Electric District . It still operates out of what is now Millennium Station , which is still called "Randolph Street Terminal" by many longtime Chicago-area residents. In honor of

5472-565: Was chartered by the Illinois General Assembly on February 10, 1851. Senator Stephen A. Douglas and later President Abraham Lincoln were both Illinois Central men who lobbied for it. Douglas owned land near the terminal in Chicago. Lincoln was a lawyer for the railroad. Illinois legislators appointed Samuel D. Lockwood , recently retired from the Illinois Supreme Court (who may have given both lawyers

5548-618: Was never among the top performers on this route. Illinois Central's largest passenger terminal, Central Station , stood at 12th Street east of Michigan Avenue in Chicago. Due to the railroad's north–south route from the Gulf of Mexico to the Great Lakes, Illinois Central passenger trains were one means of transport during the African American Great Migration of the 1920s. Illinois Central's most famous train

5624-461: Was the Panama Limited , a premier all-Pullman car service between Chicago and New Orleans, with a section breaking off at Carbondale to serve St. Louis. In 1949, it added a daytime all-coach companion, the City of New Orleans , which operated with a St. Louis section breaking off at Carbondale and a Louisville section breaking off at Fulton, Kentucky . In 1967, due to losses incurred by

5700-414: Was the longest railroad in the world. Its main line went from Cairo, Illinois , at the southern tip of the state, to Galena , in the northwest corner. A branch line went from Centralia (named for the railroad), to the rapidly growing city of Chicago . In Chicago, its tracks were laid along the shore of Lake Michigan and on an offshore causeway downtown, but land-filling and natural deposition have moved

5776-696: Was used by the German Ministry of Transport for two large passenger ships called the Preussen and Hansestadt Danzig . The design was licensed to several manufacturers and turbochargers began to be used in marine, railcar and large stationary applications. Turbochargers were used on several aircraft engines during World War II, beginning with the Boeing B-17 Flying Fortress in 1938, which used turbochargers produced by General Electric. Other early turbocharged airplanes included

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