The Pennsylvania Railroad No. 10 was a Class K D6 4-4-0 "American Standard" steam locomotive built in 1881 at the PRR's Altoona Works for passenger service on the road, which it did for much of its career.
No. 10, and like all the other locomotives they were equipped with 78-inch (1,981 mm) drivers and seven were later converted to 72-inch (1,829 mm) drivers and classified D6a.
By the mid-to-late-1900's the locomotive was retired from active service and later it was sold for scrap.