They were used at least until 1958. #800, 809, 821, and 830 were re-numbered in 1958 to make room for 800 class GP9s then arriving on N&W. The new numbers were 10,11,12, and 13, respectively. Prince's N&W book lists 1960 as the last date for these shop goats. Pic for anyone that's never seen one: http://spec.lib.vt.edu/imagebase/norfolksouthern/full/ns951.jpeg Mark
