Pennsylvania Railroad class D7
Class D7 on the Pennsylvania Railroad was a class of 4-4-0 steam locomotive.
Fifty-eight were built by the PRR's Altoona Works between 1882–1891 with drivers, while sixty-one of class D7a were constructed with drivers.
The D7 was fundamentally an anthracite-burning version of the PRR D6, with a larger fire-grate in order to burn the slower-burning, harder coal.
