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The Pennsylvania Railroad's K4s class Pacific number 1737 was the prototype of the class of 4-6-2 steam locomotives that eventually would number 425 locomotives.

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Pennsylvania Railroad 1737
PRR 1737 builder's photo.
Type and origin Power type Steam Builder Altoona Works Serial number 2825 Build date 1914
Specifications Configuration: ​  • Whyte 4-6-2 Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 36 in (914 mm) Driver dia. 80 in (2,032 mm) Trailing dia. 50 in (1,270 mm) Wheelbase 13 ft 10 in (4.2 m) between driving axles Length 83 ft 6 in (25.5 m) Axle load 66,500 lb (30,200 kg; 30.2 t) Adhesive weight 199,500 lb (90,500 kg; 90.5 t) Loco weight 304,500 lb (138,100 kg; 138.1 t) Tender weight 212,725 lb (96,490 kg; 96.490 t) Total weight 517,225 lb (234,609 kg; 234.609 t) Fuel type Coal Fuel capacity 22 short tons (20 t) Water cap. 11,300 US gallons (43,000 l) Firebox:  • Firegrate area 69.89 sq ft (6.49 m2)[1] Boiler pressure 205 psi (1,413 kPa)[1] Heating surface 4,041 square feet (375 m2) Cylinder size 27 in × 28 in (686 mm × 711 mm)[1] Valve gear Walschaert Valve type Piston valves
Performance figures Tractive effort 44,460 lbf (197,770 N)[1] Factor of adh. 4.54
Career Operators Pennsylvania Railroad Class K4s Numbers PRR 1737 Delivered 1914 First run 1914 Disposition Scrapped in 1960

The Pennsylvania Railroad in 1914 needed a steam locomotive to haul the passenger trains that the smaller E class Atlantics (4-4-2) could not handle. The 1737 was the first K4s ever built for the PRR. In passenger service, the 1737 would handle passenger trains, like the railroad's flagship passenger train, the Broadway Limited. In the 1930s, as the Pennsylvania Railroad 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 locomotive, the Pennsylvania Railroad 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.

Fate

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.[2] 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.[3]

See also

• Pennsylvania Railroad 1361

References

Sources

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