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- PRR_S2 abstract "The Pennsylvania Railroad's class S2 was a steam turbine locomotive. One was built, #6200, delivered in 1944. The S2 was the sole example of the 6-8-6 wheel arrangement in the Whyte notation, with a six-wheel leading truck, eight driving wheels, and a six-wheel trailing truck. The S2 used a direct-drive steam turbine; the turbine was geared to the center pair of axles with the outer two axles connected by side rods. The disadvantage was that the turbine could not operate at optimal speeds over the locomotive's entire speed range. The S2 was the largest direct-drive turbine locomotive design ever built.The locomotive was to be a 4-8-4, but wartime restrictions on light steel alloys increased weight until six-wheel leading and trailing trucks were needed. Two turbines were fitted, one for forward travel and a smaller one for reversing at speeds up to 22 mph. A large boiler with a Belpaire firebox and long combustion chamber was fitted. The turbine exhaust was piped through a set of four nozzles in the smokebox, providing an even draft for the fire and exiting through a unique quadruple stack. A Worthington-pattern feedwater heater was fitted for increased efficiency. Twin air pumps for train braking were fitted below the running boards beside the smokebox front, and a large radiator assembly at the nose cooled the compressed air. The large 16-wheel tender was similar to that used on the PRR's other large passenger locomotives, the T1 and S1.The locomotive proved to be powerful and capable, with reserves of power at speed and reasonable fuel economy. The turbine drive was easy on the track and allowed more power at the rail. While economical at speed, the locomotive was highly uneconomical at lower speed. The turbine used less steam than conventional locomotives above 30 mph; below that, the locomotive used too much steam and fuel. The boiler normally operated at 310 PSI, but at low speed the pressure could drop as low as 85 PSI. The increased fuel usage at low speeds caused the firebox to run hotter, which sometimes caused stay bolts to break. The locomotive's problems and the advantages of the emerging Diesel locomotive ensured #6200 would never be duplicated. The locomotive was withdrawn from service in 1949 and scrapped in 1953.".
- PRR_S2 activeYearsEndYear "1944".
- PRR_S2 activeYearsStartYear "1944".
- PRR_S2 builder Baldwin_Locomotive_Works.
- PRR_S2 numberBuilt "1".
- PRR_S2 powerType Steam_turbine.
- PRR_S2 thumbnail PRR_S2.jpg?width=300.
- PRR_S2 wikiPageExternalLink s2.
- PRR_S2 wikiPageExternalLink locoloco.htm.
- PRR_S2 wikiPageExternalLink pennturb.htm.
- PRR_S2 wikiPageID "1283811".
- PRR_S2 wikiPageRevisionID "641583721".
- PRR_S2 builddate "1944".
- PRR_S2 builder Baldwin_Locomotive_Works.
- PRR_S2 caption "The single S2, #6200, in a PRR promotional image.".
- PRR_S2 deliverydate "1944".
- PRR_S2 disposition "Scrapped".
- PRR_S2 driverdiameter "68.0".
- PRR_S2 firstrundate "1944".
- PRR_S2 fleetnumbers "6200".
- PRR_S2 hasPhotoCollection PRR_S2.
- PRR_S2 lastrundate "1946".
- PRR_S2 maxspeed "At least".
- PRR_S2 name "Pennsylvania Railroad S2".
- PRR_S2 numinclass "1".
- PRR_S2 operator Pennsylvania_Railroad.
- PRR_S2 operatorclass "S2".
- PRR_S2 powertype "Steam Turbine".
- PRR_S2 retiredate "1946".
- PRR_S2 scrapdate "1952".
- PRR_S2 serialnumber "6200".
- PRR_S2 totalproduction "1".
- PRR_S2 whytetype "6".
- PRR_S2 subject Category:6-8-6_locomotives.
- PRR_S2 subject Category:Baldwin_locomotives.
- PRR_S2 subject Category:Experimental_locomotives.
- PRR_S2 subject Category:Individual_locomotives_of_the_United_States.
- PRR_S2 subject Category:Passenger_locomotives.
- PRR_S2 subject Category:Pennsylvania_Railroad_locomotives.
- PRR_S2 subject Category:Scrapped_locomotives.
- PRR_S2 subject Category:Standard_gauge_railway_locomotives.
- PRR_S2 subject Category:Steam_locomotives_of_the_United_States.
- PRR_S2 subject Category:Steam_turbine_locomotives.
- PRR_S2 subject Category:Unique_locomotives.
- PRR_S2 type Locomotive.
- PRR_S2 type MeanOfTransportation.
- PRR_S2 type Product.
- PRR_S2 type DesignedArtifact.
- PRR_S2 type Thing.
- PRR_S2 type Q93301.
- PRR_S2 comment "The Pennsylvania Railroad's class S2 was a steam turbine locomotive. One was built, #6200, delivered in 1944. The S2 was the sole example of the 6-8-6 wheel arrangement in the Whyte notation, with a six-wheel leading truck, eight driving wheels, and a six-wheel trailing truck. The S2 used a direct-drive steam turbine; the turbine was geared to the center pair of axles with the outer two axles connected by side rods.".
- PRR_S2 label "PRR S2".
- PRR_S2 label "PRR-Klasse S2".
- PRR_S2 sameAs PRR-Klasse_S2.
- PRR_S2 sameAs m.04p_99.
- PRR_S2 sameAs Q7120510.
- PRR_S2 sameAs Q7120510.
- PRR_S2 wasDerivedFrom PRR_S2?oldid=641583721.
- PRR_S2 depiction PRR_S2.jpg.
- PRR_S2 homepage locoloco.htm.
- PRR_S2 isPrimaryTopicOf PRR_S2.
- PRR_S2 name "Pennsylvania RailroadS2".