Pennsylvania Railroad E7s
Type and origin
Power typeSteam
BuilderAltoona Works, Alco
Build dateThe rebuilding of these locomotives began in 1916
Total produced90
Specifications
Configuration:
  Whyte4-4-2
Gauge4 ft 8+12 in (1,435 mm)
Leading dia.36 in (910 mm)
Driver dia.80 in (2,000 mm)
Trailing dia.50 in (1,300 mm)
Length68 ft 6 in (20.88 m) (including 55P58 tender)[1]
Adhesive weight118,400 lb (53,705.3 kg)[1]
Loco weight171,100 lb (77,609.7 kg)[1]
Tender weight89,050 lb (40,392.4 kg)
Fuel typeCoal
Fuel capacity12 t (11.8 long tons; 13.2 short tons)[1]
Water cap.5,800 US gallons (22,000 L; 4,800 imp gal)[1]
Firebox:
  Grate area55.5 sq ft (5.2 m2)
Boiler pressure205 psi (1,410 kPa)
Cylinders2
Cylinder size22.5 in × 26 in (572 mm × 660 mm)
Performance figures
Tractive effort27,409 lbf (121,920 N)
Career
PreservedOne (No. 7002) preserved, remainder scrapped
DispositionNo. 7002 on display

The Pennsylvania Railroad's class E2, E3, E7 steam locomotives were of the 4-4-2 "Atlantic" passenger type, frequently called light Atlantics after the introduction of the heavier E6 Atlantics. All were similar in size and boiler capacity but differed in firebox type, valves and valve gear and cylinder diameter. Classes E2 and E3 were built simultaneously. Starting in 1916 a rebuilding program converted ninety class E2a,b,c to class E7s by replacing slide valves with piston valves and increasing cylinder diameter from 20.5 to 22.5 inches (520 to 570 mm). Fourteen class E2 were similarly converted to class E7sa. Ninety class E2a,d, E3a,d were converted to class E3sd. These improvements allowed many of the engines to remain in active service into the 1930s.

The sub-classes differed as follows:[2]

Class Firebox Cylinder size Valves Valve gear Number built Years built
E2 Radial-stay 20 ½” x 26” Slide Stephenson 88 1901-02
E2a Belpaire 20 ½” x 26” Slide Stephenson 93 1902-05
E2b Belpaire 20 ½” x 26” Piston Stephenson 70 1903-04
E2c Belpaire 20 ½” x 26” Slide Stephenson 22 1903
E2d Belpaire 20 ½” x 26” Piston Walschaerts 32 1906-08
E3 Radial-stay 22” x 26” Slide Stephenson 8 1901-02
E3a Belpaire 22” x 26” Slide Stephenson 114 1903-05
E3d Belpaire 22” x 26” Piston Walschaerts 56 1906-10
E7s Belpaire 22 ½” x 26” Piston Stephenson 90 conv. fr. E2a,b,c 1916-20
E7sa Radial-stay 22 ½” x 26” Piston Stephenson 14 conv. fr. E2 1916-20

In the first decade of the twentieth century classes E2 and E3 handled all of the fast passenger trains of the Pennsylvania Railroad. As train weights increased due to the switch to steel passenger cars and more cars per train, the “light” Atlantics were usually doubleheaded. Eventually, as Pacific class K2 and K3 became available, they were relegated to secondary service

Engine #7002

This engine was built in 1902 as a class E2 for the Pennsylvania Railroad as engine No. 7002. On the first westward run of the Pennsylvania Special (renamed the Broadway Limited in 1912) in June 1905 the conductor clocked the train over three miles just west of Lima, Ohio in 85 seconds, at a record speed of 127.1 miles per hour (204.5 km/h). (Many doubt the claim; the train averaged about 68 mph from Crestline to Fort Wayne.) No. 7002 was rebuilt to class E7sa in August 1916 and scrapped in 1935. When the PRR was looking for an E7 class locomotive for preservation, they refurbished No. 8063 (an E2a from the PRR) and substituted No. 7002’s engine number and builder’s plate. No. 8063 is a PRR E2a built in 1905. The engine was donated to Railroad Museum of Pennsylvania in 1979 and put into operating order by Strasburg Rail Road where it ran for a number of years, sometimes doubleheading with PRR D16 No. 1223. It last ran on December 20, 1989.

References

  1. 1 2 3 4 5 Pennsylvania Railroad. "PRR E2a,E3a Steam Loco". PRR.Railfan.net. Retrieved January 2, 2008.
  2. Staufer, Alvin F; Edson, D. William; Harley, E. Thomas (1993). Pennsy Power III. Staufer Books & Prints. ISBN 0-944513-10-7.
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