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PRR R1.jpg
R1 #4800 in its builders' portrait
Type and origin
Power type Electric
Builder Baldwin-Westinghouse
Serial number BLW: 61817
Build date 1934
Total produced 1
Configuration 4-D-4
AAR wheel arr. 2-D-2
UIC classification 2'D2'
Leading wheel
36 in (0.914 m)[1]
Driver diameter 62 in (1.575 m)[1]
Wheelbase 54 ft 0 in (16.46 m)[1]
Length 64 ft 8 in (19.71 m)[1]
Width 10 ft 6.19 in (3.21 m)[1]
Height 15 ft 0 in (4.57 m) over locked-down pantographs[1]
Axle load 57,500 lb (26.1 t)[1]
Weight on drivers 230,000 lb (104.3 t)[1]
Locomotive weight 402,000 lb (182.3 t)[2]
Fuel capacity 487 US gal (1,840 l; 406 imp gal) (for train heat boiler)[1]
Water capacity 2,041 US gal (7,730 l; 1,699 imp gal) (for train heat boiler)[1]
Electric system(s) 11 kV AC @ 25 Hz
Current collection
Traction motors Westinghouse, 625 hp (466 kW), eight off
Performance figures
Maximum speed 100 mph (160 km/h)[2]
Power output 5,000 hp (3,700 kW)[2]
Tractive effort 18,750 lbf (83.4 kN) at 100 mph (160 km/h)
Number(s) 4800, later 4899, later 4999
Retired 1959
Scrapped 1959

The Pennsylvania Railroad's class R1 comprised a single prototype electric locomotive constructed in 1934 by the Baldwin Locomotive Works of Philadelphia, Pennsylvania, USA, 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 The R1 was withdrawn from service and sent for scrap in 1958.[3]

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'Do'2). In many respects the design resembled the earlier, lighter P5, but with an extra driving axle and lower axle loads.


  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. (1962). Pennsy Power. Staufer. LOC 62-20878. 
  3. ^ a b Barris, Wes. "The Pennsylvania Railroad GG1: The R1". SteamLocomotive.com. Retrieved 2008-08-27. 

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