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Pennsylvania class E2
United States | 1901 | 299 produced
The first built E2 No. 269
The first built E2 No. 269
Railway and Locomotive Engineering, January 1900

To overcome the disadvantages of the Class E1 Camelback Atlantics, the E2 was developed in a conventional arrangement. The elimination of the Wootten firebox reduced the grate area from 69 to 51 square feet and eliminated the combustion chamber, but increased the heating area from 2,320 to 2,430 square feet. The dimensions of the cylinders and wheels remained the same, and the same three-axle tender was used. Only the later variants received four-axle tenders.

After 82 examples of the class E2, a total of 93 examples of the class E2a were manufactured from 1902. They differed from the original model mainly in the Belpaire firebox and 32 of them came from ALCO-Schenectady. In 1903 and 1904, 70 E2bs were built, which still had Stephenson valve gear, but now had piston instead of flat slide valves. Four of them formed the basis for the E28 and E29 class compound engines. Parallel to the E2b, 22 E2c were built, which again had slide valves. Finally, between 1906 and 1908, 32 E2d followed, which now had Walschaert valve gear and piston valves. In order to achieve a higher adhesive weight, the three carrying axles were loaded by a total of around five tons less than on the E2c.

E2b No. 8478 with Belpaire Firebox
E2b No. 8478 with Belpaire Firebox
Railway and Locomotive Engineering, August 1904

A large number of locomotives of the various E2 variants were later converted to superheated steam. This included the E2sd class, which compared to the E2d showed hardly any differences apart from the superheater. Others were converted to different variants of the E3 and E7. These had larger cylinders and some smaller coupled wheels

ManufacturerAltoonaAltoona, ALCOAltoona
Axle config4-4-2 (Atlantic) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase30 ft 10 in30 ft 9 1/2 in
Fixed wheelbase7 ft 6 in7 ft 5 in
Total wheelbase53 ft 9 1/2 in60 ft 2 1/2 in60 ft 6 1/2 in
Service weight169,350 lbs184,167 lbs190,400 lbs193,200 lbs
Adhesive weight110,630 lbs110,001 lbs122,900 lbs125,800 lbs
Total weight318,667 lbs325,400 lbs345,100 lbs
Axle load51,105 lbs56,667 lbs62,300 lbs63,300 lbs
Water capacity4,000 us gal7,000 us gal5,800 us gal
Fuel capacity13,000 lbs (coal)20,000 lbs (coal)27,200 lbs (coal)31,200 lbs (coal)
Power sourcesteam
Estimated power1,400 hp (1,044 kW)1,600 hp (1,193 kW)1,750 hp (1,305 kW)
Optimal speed42 mph43 mph49 mph
Starting effort21,477 lbf23,799 lbf22,638 lbf
Power Plant
Driver diameter80 in
Boiler pressure185 psi205 psi195 psi
Expansion typesimple
Cylinderstwo, 20 1/2 x 26 in
Grate area51 sq ft55.5 sq ft
Firebox area152 sq ft165.7 sq ft166 sq ft187 sq ft
Tube heating area2,278 sq ft2,474.3 sq ft2,474 sq ft1,854 sq ft
Evaporative heating area2,430 sq ft2,640 sq ft2,041 sq ft
Superheater area412 sq ft
Total heating area2,430 sq ft2,640 sq ft2,453 sq ft
Calculated Values
steam locomotive
last changed: 09/2022

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