Class D7 (formerly Class A (anthracite), pre-1895) on the Pennsylvania Railroad was a class of steam locomotive. Fifty-eight were built by the PRR's Altoona Works (now owned by Norfolk Southern) between 1882âÂÂ1891 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.