Pennsylvania Railroad class D14

PRR D14
PRR D14a #1651 in its builders’ photograph
Type and origin Power type Steam Builder PRR Altoona Works Build date 1893–1894 Total produced 22
Specifications Configuration: ​  • Whyte 4-4-0  • UIC 2′B Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 36 in (914 mm) Driver dia. 78 in (1,981 mm) (D14) 80 in (2,032 mm) (D14a) 68 in (1,727 mm) (D14b/c) Wheelbase 22 ft 8+1⁄2 in (6.92 m) Length 57 ft 6+1⁄4 in (17.53 m) (including tender) Height 15 ft (4.57 m)

Class D14 on the Pennsylvania Railroad was a type of steam locomotive with a 4-4-0 wheel arrangement in the Whyte notation. They were originally designated class P in the PRR's pre-1895 classification scheme. Twenty-two locomotives were built at the PRR's Altoona Works (now owned by Norfolk Southern); six in 1893 with 78-inch (1,981 mm) driving wheels, and sixteen in 1894 with 80-inch (2,032 mm) drivers, classified D14a. Later, all sixteen class D14a were rebuilt to class D14b with 68-inch (1,727 mm) drivers for secondary service after they were replaced in top-flight express service, while three of the six class D14 were similarly rebuilt to class D14c.