They tried a jet powered train in 1966, it didn't take off, pardon the pun. There was also the Thomas the tank engine story of Thomas and the jet engine, but I think that is about it for railways and jets. What did you have in mind for it?
I thought it would be a very nice/brandable DN for rail company like EasT Japan Railway (J+ET Railway) or other companies working in railway industry...Plus I believe that in the future the potential of railway transport will grow exponentially...