NS 34 was originally a Norfolk & Western SD35, you got it Stuart!
NS 34 was originally Norfolk & Western SD35 No. 1530, which General Motors built in 1965. The East End Locomotive Shops rebuilt it in 1977 as a road slug, model RP-E6, and renumbered it 9921, then 9951. NS put the slug into storage in 1993, then rebuilt it in 1998 to carry the track measuring system for Research and Tests.
Mike