PRR 3750

PRR 3750

Type and origin Power type Steam Builder Altoona Works Build date 1918

Specifications Configuration 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) Loco weight 274,500 lb (124,511 kg) Firebox:  • Firegrate area 70 sq ft (7 m2) Boiler pressure 205 psi (1,413 kPa) Cylinder size 27 in × 28 in (686 mm × 711 mm)

Performance figures Tractive effort 44,460 lbf (197,767.9 N) Factor of adh. 4.54

Career Operators Pennsylvania Railroad Class K4s Current owner Pennsylvania Historical and Museum Commission U.S. National Register of Historic Places Official name Passenger Locomotive No. 1737 Designated December 17, 1979 Part of Pennsylvania Railroad Rolling Stock Thematic Resource Reference no. 79002273

Type and origin
Power type	Steam
Builder	Altoona Works
Build date	1918

Specifications
Configuration	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)
Loco weight	274,500 lb (124,511 kg)
Firebox:  • Firegrate area	70 sq ft (7 m2)
Boiler pressure	205 psi (1,413 kPa)
Cylinder size	27 in × 28 in (686 mm × 711 mm)

Performance figures
Tractive effort	44,460 lbf (197,767.9 N)
Factor of adh.	4.54

Career
Operators	Pennsylvania Railroad
Class	K4s
Current owner	Pennsylvania Historical and Museum Commission
U.S. National Register of Historic Places
Official name	Passenger Locomotive No. 1737
Designated	December 17, 1979
Part of	Pennsylvania Railroad Rolling Stock Thematic Resource
Reference no.	79002273

Coordinates: 39°58′56″N 79°9′40″W / 39.98222°N 79.16111°W / 39.98222; -79.16111

Pennsylvania Historical and Museum Commission

PRR 3750 is a Pennsylvania Railroad K4s steam locomotive located in the Railroad Museum of Pennsylvania, outside of Strasburg, Pennsylvania in the United States. For over a decade, 3750 stood in for the prototype K4s, 1737, and was listed on the National Register of Historic Places in 1979. It is one of the two remaining K4s locomotives and, along with PRR 1361, was designated the official state steam locomotive in 1987 by the Pennsylvania General Assembly.

PRR 3750 was used to haul the Pennsylvania Railroad's main line passenger trains such as the Broadway Limited. Despite the attempt by railroad management to replace the K4s with the K5 and T1, the K4s would remain in action until dieselization in 1957. The 3750 was spared from being scrapped because, when the Pennsylvania Railroad was considering steam engines for preservation, the first K4, 1737, had deteriorated to the point that it was not worth preserving. The Pennsylvania decided to scrap 1737 and use 3750 as a stand-in; 3750 received the original number plates and tender from 1737.

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