Pennsylvania Railroad E6 class

PRR E6s
E6s #1067 in its builder's photograph.
Type and origin Power type Steam Designer Alfred W. Gibbs Builder PRR Juniata Shops Build date 1910–1914 Total produced 83
Specifications Configuration: ​  • Whyte 4-4-2  • UIC 2'B1' Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading dia. 36 in (914 mm)[1] Driver dia. 80 in (2,032 mm)[1] Trailing dia. 50 in (1,270 mm)[1] Wheelbase 29 ft 7+1⁄2 in (9.030 m)[1] Length 41 ft 3+1⁄2 in (12.586 m) (locomotive only)[1] 72 ft 6 in (22.10 m) (including tender)[2] Width 10 ft 0 in (3.05 m)[3] Height 15 ft 0 in (4.57 m)[1] Axle load 66,000 lb (30,000 kg)[2] Adhesive weight 136,000 lb (62,000 kg)[2] Loco weight 243,600 lb (110,500 kg)[1] Total weight 401,600 lb (182,200 kg)[2] Fuel type Soft coal[1] Fuel capacity 25,000 lb (11,000 kg)[2] Water cap. 7,000 US gal (26,000 L; 5,800 imp gal)[2] Firebox: ​  • Grate area 55.13 sq ft (5.122 m2)[1] Boiler pressure 205 psi (1.41 MPa)[2] Heating surface: ​  • Firebox 218 sq ft (20.3 m2)[1]  • Tubes 1,900.66 sq ft (176.577 m2)[1]  • Flues 777.54 sq ft (72.236 m2)[1]  • Total surface 2,896.20 sq ft (269.066 m2) Superheater: ​  • Heating area 980 sq ft (91 m2)[2] (E6s only) Cylinders 2[2] Cylinder size 26 in × 23+1⁄2 in (660 mm × 597 mm)[1] Valve gear Walschaert Valve type piston valves
Performance figures Maximum speed 75 mph (121 km/h) Tractive effort 31,275 lbf (139.12 kN)[2] Factor of adh. 4.35
Career Operators Pennsylvania Railroad, Pennsylvania-Reading Seashore Lines, Long Island Rail Road Class E6s Preserved One preserved (No. 460) Disposition PRR 460 on display, remainder scrapped

The Pennsylvania Railroad Class E6 was the final type of 4-4-2 "Atlantic" locomotive built for the company, and second only to the Milwaukee Road's streamlined class A in size, speed and power. Although quickly replaced on the fastest trains by the larger K4s Pacifics, the E6 remained a popular locomotive on lesser services and some lasted until the end of steam on the PRR. One, #460, called the Lindbergh Engine, is preserved at the Railroad Museum of Pennsylvania.^[4] It was moved indoors to begin preparations for restoration on March 17, 2010. On January 10, 2011, PRR #460 was moved to the museum's restoration shop for a two- to three-year project, estimated to cost $350,000. The engine is listed in the National Register of Historic Places. ^[5]