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PRR O1 locomotive No. 7850 in a Pennsylvania Railroad promotional photo.

PRR O1 locomotive No. 7850 in a Pennsylvania Railroad promotional photo.

By Source, Fair use, https://en.wikipedia.org/w/index.php?curid=17224384

PRR O1 Class Electric Locomotive

The Pennsylvania Railroad's class O1 comprised eight experimental boxcab electric locomotives built in 1930 and 1931. They were built in preparation for the New York to Washington Electrification project. They had the wheel arrangement classified as 4-4-4 in the Whyte notation (UIC: 2'B2'; AAR: 2-B-2). Although successful, they were not powerful enough for the railroad's increasingly heavy trains. For production, the PRR chose to concentrate on the P5 class, effectively an enlarged and more powerful version of the O1 with an additional pair of driving wheels.

The eight locomotives were divided into four sub-classes — O1, O1a, O1b, and O1c. Each sub-class was fitted with a different combination of traction motor power output and drive gear ratio. In addition, three O1 locomotives were fitted with General Electric equipment, three with Westinghouse, and two with Brown Boveri. The O1b locomotives used a Buchli drive system to link the traction motors to the driving wheels.

Roster:

Class: O1
Numbers: 7850–1
Motors: 4 × 500 hp (370 kW)
Power: 2,000 hp (1,500 kW)
Gear Ratio: 31:91
Maximum Tractive Effort: 28,500 lbf (127 kN)
Continuous Tractive Effort: 13,200 lbf (59 kN) @ 56 mph (90 km/h)

Class: O1a

Numbers: 7852–3
Motors: 4 × 625 hp (466 kW)
Power: 2,500 hp (1,900 kW)
Gear Ratio: 36:103
Maximum Tractive Effort: 37,500 lbf (167 kN)
Continuous Tractive Effort: 14,900 lbf (66 kN) @ 63 mph (101 km/h)

Class: O1b

Numbers: 7854–5
Motors: 4 × 550 hp (410 kW)
Power: 2,200 hp (1,600 kW)
Gear Ratio: 49:114
Maximum Tractive Effort: 35,000 lbf (160 kN)
Continuous Tractive Effort: 17,800 lbf (79 kN) @ 46 mph (74 km/h)

Class: O1c

Numbers: 7856–7
Motors: 4 × 625 hp (466 kW)
Power: 2,500 hp (1,900 kW)
Gear Ratio: 31:91
Maximum Tractive Effort: 37,500 lbf (167 kN)
Continuous Tractive Effort: 14,900 lbf (66 kN) @ 63 mph (101 km/h)

They were generally employed in pairs by sub-class, generally on short-distance passenger trains between Newark, New Jersey and New York City's Pennsylvania Station. During World War II they were used on the "Susquehannock" between Harrisburg, Pennsylvania and New York City. Later in life, they were used for transfer work around Penn Station and Sunnyside Yard, mostly hauling empty passenger stock. They were all out of service and scrapped by the mid 1960s.

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PRR O1 Overview
Type and origin
Power type: electric
Builder: PRR Altoona Works
Build date: 1930–1931
Total produced: 8

Specifications:
Configuration: 4-4-4
AAR wheel arrangement: 2-B-2
UIC class: 2'B2'
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Leading diameter: 36 in (914 mm)
Driver diameter: 72 in (1,829 mm)
Trailing diameter: 36 in (914 mm)
Wheelbase: 40 ft (12.19 m) (overall)
Wheelbase: 10 ft (3.05 m) (fixed)
Length: 52 ft 8 in (16.05 m)
Width: 10 ft 6 in (3.20 m)
Height: 15 ft (4.57 m) (over locked-down pantographs)
Axle load: O1,O1b,O1c: 75,000 lb (34,000 kg), O1a: 78,000 lb (35,000 kg)
Adhesive weight: O1,O1b,O1c: 150,000 lb (68,000 kg), O1a: 156,000 lb (71,000 kg)
Locomotive weight: O1,O1b,O1c: 300,000 lb (140,000 kg), O1a: 309,400 lb (140,300 kg)
Electric system: 11 kV 25 Hz AC Catenary
Current collection: Pantograph
Traction motors: 4 (2 per axle), power output each - O1: 500 hp (370 kW); O1a,O1c: 625 hp (466 kW); O1b: 550 hp (410 kW)
Transmission: AC current fed via transformer tap changers to paired motors driving geared quill drive
Train heating: Steam generator
Locomotive brake: Air
Train brakes: Air
Safety systems: Cab signalling

Performance figures
Maximum speed: 90 mph (140 km/h)
Power output: O1: 2,000 hp (1,500 kW); O1a,O1c: 2,500 hp (1,900 kW); O1b: 2,200 hp (1,600 kW)
Tractive effort: O1: 28,500 lbf (127 kN); O1a,O1c: 37,500 lbf (167 kN); O1b: 35,000 lbf (160 kN)
Factor of adhesion: O1: 5.26; O1a: 4.16; O1b: 4.29; O1c: 4.00

Career
Operator: Pennsylvania Railroad
Numbers: 7850–7857
Retired: 1948–49 (6), 1961 (2)
Disposition: All scrapped

See also:

Electric Locomotives

PRR Locomotive Classifications

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