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Pennsylvania Railroad 1737
PRR 1737 builder's photo.
Type and origin
Power typeSteam
BuilderAltoona Works
Serial number2825
Build dateMay 1914
 • Whyte4-6-2
Gauge4 ft 8+12 in (1,435 mm)
Leading dia.36 in (914 mm)
Driver dia.80 in (2,032 mm)
Trailing dia.50 in (1,270 mm)
Wheelbase13 ft 10 in (4.2 m) between driving axles
Length83 ft 6 in (25.5 m)
Axle load66,500 lb (30,200 kg; 30.2 t)
Adhesive weight199,500 lb (90,500 kg; 90.5 t)
Loco weight304,500 lb (138,100 kg; 138.1 t)
Tender weight212,725 lb (96,490 kg; 96.490 t)
Total weight517,225 lb (234,609 kg; 234.609 t)
Fuel typeCoal
Fuel capacity22 short tons (20 t)
Water cap.11,300 US gallons (43,000 L)
 • Grate area69.89 sq ft (6.49 m2)[1]
Boiler pressure205 psi (1,413 kPa)[1]
Heating surface4,041 square feet (375 m2)
Cylinder size27 in × 28 in (686 mm × 711 mm)[1]
Valve gearWalschaert
Valve typePiston valves
Performance figures
Tractive effort44,460 lbf (197,770 N)[1]
Factor of adh.4.54
OperatorsPennsylvania Railroad
  • PRR 1737
First run1914
DispositionScrapped in 1960

Pennsylvania Railroad 1737 was a 4-6-2 Pacific type K4 class steam locomotive built in 1914 as the first of its class and would haul heavier passenger trains that the smaller E class 4-4-2 Atlantics could not handle such as the PRR's flagship passenger train, the Broadway Limited. In the 1930s, as the PRR had increased passenger service time tables, the trains became longer and heavier than a single K4s could handle, necessitating double-heading with a second engine. The "Standard Railroad Of The World" made attempts to replace the 1737 and its sisters with larger, more powerful classes including: K5, S1, and the T1, none of which were successful; thus, the K4s continued hauling passenger trains until the Pennsylvania Railroad replaced steam locomotives with the increasingly-popular and less-costly diesel-electric locomotives in 1957.

Commuter service

The 1737 was no stranger to commuter service. The New York and Long Branch Railroad in South Amboy, New Jersey used the K4s to haul commuter trains. When the famous electric Pennsylvania Railroad class GG1 would bring the trains from New York City's Penn Station, the K4s would take over the train and make the run from the South Amboy station to Bay Head, New Jersey.


The 1737 was originally slated to be preserved as part of the PRR's Historical Collection at a roundhouse in Northumberland, Pennsylvania. However, by the late 1950s, 1737 had deteriorated to the point where the PRR deemed the locomotive in very poor condition to be preserved. Instead, the PRR quietly took another K-4, No. 3750, and renumbered it to represent No. 1737 while the real No. 1737 was broken up for scrap in 1960.[2]

See also


  1. ^ a b c d Staufer 1962, p. 163.
  2. ^ "PRR Pacific Class No. 3750 K4". Railroad Museum of Pennsylvania.