PRR E2
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:

Class: E2

Firebox: Radial-stay
Cylinder size: 20 ½” x 26”
Valves: Slide
Valve gear: Stephenson
Number built: 88
Years built: 1901-02

Class: E2a

Firebox: Belpaire
Cylinder size: 20 ½” x 26”
Valves: Slide
Valve gear: Stephenson
Number built: 93
Years built: 1902-05

Class: E2b

Firebox: Belpaire
Cylinder size: 20 ½” x 26”
Valves: Piston
Valve gear: Stephenson
Number built: 70
Years built: 1903-04

Class: E2c

Firebox: Belpaire
Cylinder size: 20 ½” x 26”
Valves: Slide
Valve gear: Stephenson
Number built: 22
Years built: 1903

Class: E2d

Firebox: Belpaire
Cylinder size: 20 ½” x 26”
Valves: Piston
Valve gear: Walschaerts
Number built: 32
Years built: 1906-08

Class: E3

Firebox: Radial-stay
Cylinder size: 22” x 26”
Valves: Slide
Valve gear: Stephenson
Number built: 8
Years built: 1901-02

Class: E3a

Firebox: Belpaire
Cylinder size: 22” x 26”
Valves: Slide
Valve gear: Stephenson
Number built: 114
1903-05

Class: E3d

Firebox: Belpaire
Cylinder size: 22” x 26”
Valves: Piston
Valve gear: Walschaerts
Number built: 56
Years built: 1906-10

Class: E7s

Firebox: Belpaire
Cylinder size: 22 ½” x 26”
Valves: Piston
Valve gear: Stephenson
Number built: 90  (converted from E2a, E2b, E2c)
Years built: 1916-20

Class: E7sa

Firebox: Radial-stay
Cylinder size: 22 ½” x 26”
Valves: Piston
Valve gear: Stephenson
Number built: 14  (converted from E2)
Years built: 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 double-headed. Eventually, as Pacific class K2 and K3 became available, they were relegated to secondary service.

Engine No. 7002
This engine was built in 1902 as a class E2 for the Pittsburgh, Fort Wayne and Chicago Railway as engine No. 2 (renumbered to 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 MPH. (Many doubt the claim; the train averaged about 68 mph from Crestline to Fort Wayne.) The 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 E7s from PCC&StL) and substituted 7002’s engine number and builder’s plate. 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 double-heading with PRR D16 No. 1223. It last ran on December 20, 1989.

Pennsylvania Railroad E7s Overview
Type and origin
Power type: Steam
Builder: Altoona Works, Alco
Build date: 1916
Total produced: 90
Specifications
Configuration: 4-4-2
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Leading diameter: 36 in (910 mm)
Driver diameter: 80 in (2,000 mm)
Trailing diameter: 50 in (1,300 mm)
Length: 68 ft 6 in (20.88 m) (including 55P58 tender)
Adhesive weight: 118,400 lb (53,705.3 kg)
Locomotive weight: 171,100 lb (77,609.7 kg)
Tender weight: 89,050 lb (40,392.4 kg)
Fuel type: Coal
Fuel capacity: 27,600 lb (12,519.1 kg)
Water capacity: 5,800 gallons (22,000 l; 4,800 imp gal)
Firebox:
 • Firegrate area: 55.5 sq ft (5.2 m2)
Boiler pressure: 205 psi (1,410 kPa)
Cylinders: 2
Cylinder size: 22.5 in × 26 in (572 mm × 660 mm)
Performance figures
Tractive effort: 27,409 lbf (121,920 N)
Career
Preserved: PRR 7002

See also:

PRR E6 Class

PRR Classes

Pennsylvania Railroad

4-4-2 Locomotives

Steam Locomotives

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A PRR Class E2 Slideshow.

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A Pennsylvania Railroad E2 Class 4-4-2, ca. 1905.

A Pennsylvania Railroad E2 Class 4-4-2, ca. 1905.

Side view of PRR 7002 at the Railroad Museum of Pennsylvania.
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Side view of PRR 7002 at the Railroad Museum of Pennsylvania.

By Photo by and (c)2015 Derek Ramsey (Ram-Man) (Self-photographed) [GFDL 1.2 (http://www.gnu.org/licenses/old-licenses/fdl-1.2.html) or CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons