Pennsylvania Railroad 1223 is a 4-4-0 steam locomotive built for the Pennsylvania Railroad in 1905 by the railroad's own Altoona Works. The locomotive is the only preserved example of the D16sb class. After retirement from active service, the locomotive ran excursions for the Strasburg Railroad, in Strasburg from 1965 to 1989. Currently the engine is on static display at the Railroad Museum of Pennsylvania in Strasburg. It was listed on the National Register of Historic Places in 1979.