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Specifications
Specifications
Configuration:;
• Whyte	2-10-4
• UIC	1′E2′ h
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver dia.	69 in (1.753 m), later 70 in (1.778 m)
Length	117 ft 8 in (35.86 m)
Width	11 ft 3 in (3.43 m)
Height	16 ft 5.5 in (5.02 m)
Adhesive weight	377,800 lb (171.4 t)
Loco weight	J-1 class: 589,975 lb (267.6 t) ; J-1a class: 579,975 lb (263.1 t)
Tender weight	411,500 lb (186.7 t)
Total weight	J-1 class: 1,001,475 lb (454.3 t) ; J-1a class: 991,475 lb (449.7 t)
Tender type	Coast-to-Coast
Fuel type	Coal
Fuel capacity	60,000 lb (27.2 t)
Water cap.	21,000 US gal (79,000 L; 17,000 imp gal)
Firebox:
• Grate area	122 sq ft (11.3 m2)
Boiler	106 in (2,692 mm)
Boiler pressure	270 psi (1.86 MPa)
Cylinders	Two
Cylinder size	29 in × 34 in (737 mm × 864 mm)
Valve gear	Baker

Type and origin
Type and origin
Power type	Steam
Builder	PRR Altoona Works
Build date	1942–1944
Total produced	125

Pennsylvania Railroad J1
Pennsylvania Railroad J1
Power type
Type and origin
Power type	Steam
Builder	PRR Altoona Works
Build date	1942–1944
Total produced	125
Configuration:;
Specifications
Configuration:;
• Whyte	2-10-4
• UIC	1′E2′ h
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver dia.	69 in (1.753 m), later 70 in (1.778 m)
Length	117 ft 8 in (35.86 m)
Width	11 ft 3 in (3.43 m)
Height	16 ft 5.5 in (5.02 m)
Adhesive weight	377,800 lb (171.4 t)
Loco weight	J-1 class: 589,975 lb (267.6 t) ; J-1a class: 579,975 lb (263.1 t)
Tender weight	411,500 lb (186.7 t)
Total weight	J-1 class: 1,001,475 lb (454.3 t) ; J-1a class: 991,475 lb (449.7 t)
Tender type	Coast-to-Coast
Fuel type	Coal
Fuel capacity	60,000 lb (27.2 t)
Water cap.	21,000 US gal (79,000 L; 17,000 imp gal)
Firebox:
• Grate area	122 sq ft (11.3 m2)
Boiler	106 in (2,692 mm)
Boiler pressure	270 psi (1.86 MPa)
Cylinders	Two
Cylinder size	29 in × 34 in (737 mm × 864 mm)
Valve gear	Baker
Maximum speed
Performance figures
Maximum speed	50 mph
Power output	5,644 hp (4,209 kW)
Tractive effort	95,100 lbf (423.0 kN) ; Booster: 15,000 lb (6.8 t) ; Loco w/Booster: 110,100 lb (49.9 t)
Numbers
Career
Numbers	6150–6174, 6401–6500
Nicknames	War Babies
Locale	Pennsylvania Railroad
Retired	1958-1959
Scrapped	1958-1959
Disposition	All scrapped

The PRR J1 was a class of 2-10-4 "Texas" type steam locomotives built between 1942 and 1944. The J1 had over 95,000 pounds-force (422.6 kN) of tractive effort, plus an additional 15,000 lbf (66.7 kN) if the booster engine was used.

Features

As with many of the Pennsylvania Railroad's steam locomotives, the J1 had its headlight above the smokebox. Like the M1 the J1 had a keystone numberplate, unlike the round numberplates seen on the rest of the PRR's freight steam locomotives. Wartime restrictions forbid the design of a completely new engine so the PRR basically adopted the C&O design almost without change. As a result, they were equipped with Baker valve gear instead of Walschaerts valve gear which was more common on the PRR. Additionally, they had radial-stay fireboxes instead of the Belpaire fireboxes seen on nearly all of the Pennsylvania Railroad's steam locomotives. Mechanically, these locomotives were identical to the C&O's T-1 class 2-10-4s.

As initially built, the middle driver was blind to facilitate tracking on curves, which was later determined to be unnecessary, and flanges were added later on. Other changes to the driving wheels included counterbalancing, as it was found in service that the J1s ran roughly like their T-1 counterparts. This was also fixed in later shopping, also increasing the driver diameter to 70 in (1,800 mm). The engine had lateral motion devices to allow sideways drive axle travel which did enable it to work on PRR curves. Other changes included the curved front side cab windows and the cast pilot with drop coupler.

History

During World War II, the PRR needed heavier locomotives to pull freight and military equipment, but wartime restrictions prohibited the development of a new locomotive design. In response to this the Pennsylvania Railroad borrowed a 2-6-6-4 Class A of the Norfolk and Western Railway and a 2-10-4 from the Chesapeake and Ohio Railway. Both locomotives underwent extensive testing, with the C&O 2-10-4 chosen to be produced. A total of 125 were built at PRR's shops in Juniata, Pennsylvania; the later 60 locomotives were classified as the J1a.^[1] They came to be known as the PRR's "War Babies," but the J1's remained in service into the 1950s.

When the Pennsylvania Railroad converted from steam power to diesel, 100 were scrapped in 1958 and the remaining 24 were scrapped the next year; however, a former J1 bell is preserved. One locomotive, 6435, is still rumored^{[by whom?]} to exist as it has no record of being scrapped, but is left unknown.^{[citation needed]}^{[speculation?]}