Pennsylvania Railroad class R1 electric locomotive in its official portrait by the Pennsylvania Railroad, 1934.

(Photo is credited "Pennsylvania Railroad", Public domain, via Wikimedia Commons)



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.

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 No. 4899, but was moved in May 1940 to No. 4999 to make room for the expanding GG1 fleet.

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 suffered A catastrophic crash in 1951 with gg1 4800 slamming into it . both trains were traveling at 100 mph . nobody was hurt but the trains were badly damaged . all motors and electric parts were salvaged from the GG1 and the shell of the R1 was taken the two trains formed the rebuilt GG1 No. 4800 .

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.



Type and origin
Power type: Electric
Builder: Baldwin-Westinghouse
Serial number BLW: 61817
Build date: 1934
Total produced: 1
​• Whyte 4-8-4
• AAR 2-D-2
• UIC 2'Do2'
Gauge: 4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading diameter: 36 in (0.914 m)
Driver diameter: 62 in (1.575 m)
Wheelbase: 54 ft 0 in (16.46 m)
Length: 64 ft 8 in (19.71 m)
Width: 10 ft 6.19 in (3.21 m)
Height: 15 ft 0 in (4.57 m) over locked-down pantographs
Axle load: 57,500 lb (26,080 kg; 26.08 t)
Adhesive weight: 230,000 lb (104,300 kg; 104.3 t)
Locomotive weight: 402,000 lb (182,300 kg; 182.3 t)
Fuel capacity: 487 US gal (1,840 L; 406 imp gal) (for train heat boiler)
Water capacity: 2,041 US gal (7,730 L; 1,699 imp gal) (for train heat boiler)
Electric system/s: 11 kV AC @ 25 Hz
Current pickup: Pantograph
Traction motors: Westinghouse, 625 hp (466 kW), eight off
Performance figures
Maximum speed: 100 mph (160 km/h)
Power output: 5,000 hp (3,700 kW)
Tractive effort: 18,750 lbf (83.4 kN) at 100 mph (160 km/h)
Numbers: 4800, later 4899, later 4999
Retired: 1959
Scrapped: 1959