PRR D15
PRR #1515 in its official builders' portrait.
Type and origin Power type Steam Builder PRR Altoona Shops[1] Build date 1892[1] Total produced 1
Specifications Configuration: ​  • Whyte 4-4-0  • UIC 2′B nv2 Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 42 in (1,067 mm)[2] Driver dia. 84 in (2,134 mm)[2] Wheelbase Coupled: 8 ft 0 in (2.44 m), Loco: 27 ft 9+1⁄4 in (8.46 m), Loco & tender: 48 ft 1 in (14.66 m)[2] Length 59 ft 7.8 in (18,181 mm)[2] Height 14 ft 11.5 in (4,559 mm)[2] Axle load 48,500 lb (22.0 tonnes)[2] Adhesive weight 84,000 lb (38.1 tonnes)[2] Loco weight 145,500 lb (66.0 tonnes)[2] Total weight 222,500 lb (100.9 tonnes)[2] Fuel type Soft coal Fuel capacity 15,000 lb (6.8 tonnes)[2] Water cap. 3,000 US gal (11,000 L; 2,500 imp gal)[2] Firebox: ​  • Grate area 30 sq ft (2.8 m2)[2] Boiler pressure 205 lbf/in2 (1.41 MPa) Heating surface: ​  • Firebox 163 sq ft (15.1 m2)[2]  • Tubes 1,662 sq ft (154.4 m2)[2]  • Total surface 1,825 sq ft (169.5 m2)[2] Cylinders 2 (Lindner compound) High-pressure cylinder 19.5 in × 28 in (495 mm × 711 mm) Low-pressure cylinder 31 in × 28 in (787 mm × 711 mm) Valve gear Stephenson
Performance figures Tractive effort 20,800 lbf (92.52 kN) Factor of adh. 4.04
Career Operators Pennsylvania Railroad Class D15 Number in class 1 Numbers 1515 Retired 1905

The class D15 (class T, pre 1895) of the Pennsylvania Railroad comprised a solitary Lindner-system cross compound steam locomotive of 4-4-0 "American" wheel arrangement in the Whyte notation. The sole locomotive was #1515, built in 1892 at the PRR's Altoona Shops. It was British in appearance with a full-length footplate, splashers, a six-wheel tender, and large 84 in (2,134 mm) drivers.^[3] It was built in 1892 by the PRR's Altoona Works, and remained in service until it was retired and scrapped in November 1905.