PRR D1
D1 #28
Type and origin Power type Steam Builder PRR Altoona Works Build date 1868–1872 Total produced 13
Specifications Configuration: ​  •  Whyte 4-4-0  •  UIC 2′B Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 26 in (660 mm) [1] Driver dia. 68 in (1,727 mm) [1] Wheelbase 22 ft 5+5⁄8 in (6.85 m) (locomotive) 44 ft 11+5⁄8 in (13.706 m) (overall) [2] Length 54 ft 6.44 in (16.6228 m) [2] Width 9 ft 0.94 in (2.77 m) [2] Height 14 ft 8 in (4.47 m) [2] Adhesive weight 42,370 lb (19.2 tonnes) [2] Loco weight 77,700 lb (35.2 tonnes) [2] Tender weight 51,400 lb (23.3 tonnes) [2] Total weight 129,100 lb (58.6 tonnes) [2] Tender type Eight-wheel with water scoop Fuel type Soft coal Fuel capacity 8,000 lb (3.6 tonnes) [2] Water cap. 2,400 US gal (9,100 L; 2,000 imp gal) [2]

The Pennsylvania Railroad's steam locomotive class D1 (formerly Class A, pre-1895) comprised thirteen 4-4-0 locomotives for express passenger service, constructed at the railroad's own Altoona Works (now owned by Norfolk Southern) during 1868–1872. ^[3] They were the first standardized class of locomotives on the railroad and shared many parts with other standard classes. ^[1]

The PRR was the first American railroad to adopt the Westinghouse air brake, the first tests of which were made in September 1869; Class A locomotives were among those fitted with air brake equipment for those earliest tests. ^{[4] [5]}

They remained in service until 1945, and were all withdrawn and scrapped by 1946.

References

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