Pennsylvania Railroad class R1

American electric locomotive prototype
4 ft 8+1⁄2 in (1,435 mm) standard gaugeLeading dia.36 in (0.914 m)[1]Driver dia.62 in (1.575 m)[1]Wheelbase54 ft 0 in (16.46 m)[1]Length64 ft 8 in (19.71 m)[1]Width10 ft 6.19 in (3.21 m)[1]Height15 ft 0 in (4.57 m) over locked-down pantographs[1]Axle load57,500 lb (26,080 kg; 26.08 t)[1]Adhesive weight230,000 lb (104,300 kg; 104.3 t)[1]Loco weight402,000 lb (182,300 kg; 182.3 t)[2]Fuel capacity487 US gal (1,840 L; 406 imp gal) (for train heat boiler)[1]Water cap.2,041 US gal (7,730 L; 1,699 imp gal) (for train heat boiler)[1]Electric system/s11 kV AC @ 25 HzCurrent pickup(s)PantographTraction motorsWestinghouse, 625 hp (466 kW), eight off
Performance figures
Maximum speed100 mph (160 km/h)[2]
Power output5,000 hp (3,700 kW)[2]
Tractive effort18,750 lbf (83.4 kN) at 100 mph (160 km/h)
Career
Numbers4800, later 4899, later 4999
Retired1959
Scrapped1959

The Pennsylvania Railroad's class R1 comprised a single prototype electric locomotive constructed in 1934 by the Baldwin Locomotive Works of Philadelphia, Pennsylvania, US, with the electrical equipment by Westinghouse.[2]

It was built as a competitor to the GG1 design, but after trials the GG1 was selected for volume production on the basis of its superior tracking and riding qualities; the R1 prototype, however, remained in service. It was numbered 4800 originally, swapped numbers with the victorious GG1 prototype to #4899, but was moved in May 1940 to #4999 to make room for the expanding GG1 fleet.[3]

For many years, the R1's regular duties involved hauling the westbound Broadway Limited and returning eastward with a mail and express train. The long rigid wheelbase of the locomotive caused occasional derailments in Sunnyside Yard and elsewhere.

The R1 design had four driven axles in a rigid locomotive frame, like a steam locomotive. Each was driven by two 625-horsepower (466 kW) traction motors driving the wheels through a quill drive and sprung cups. Each end of the double-ended locomotive has a four-wheel truck to guide the locomotive at speed, giving the R1 a 4-8-4 wheel arrangement in the Whyte notation (AAR: 2-D-2; UIC: 2'Do2'). Besides the R1, the PRR did not build or order any other 4-8-4 locomotives, however the T1 duplex was essentially a 4-8-4 with 2 sets of driving wheels, making it a 4-4-4-4. In many respects the design resembled the earlier, lighter P5, but with an extra driving axle and lower axle loads.

References

  1. ^ a b c d e f g h i j Pennsylvania Railroad. "PRR R1 Diagram". PRR.Railfan.net. Retrieved 2008-08-27.
  2. ^ a b c d Staufer, Alvin F.; Pennypacker, Bert (1962). Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900-1957. Research by Martin Flattley. Carollton, Ohio: Alvin F. Staufer. ISBN 978-0-9445-1304-0.
  3. ^ Barris, Wes. "The Pennsylvania Railroad GG1: The R1". SteamLocomotive.com. Retrieved 2008-08-27.
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