Class 73 - Caledonian (Early) - 7396873968 Caledonian Sleeper, Early Partnering with 73967 for the early Mk5 period is 73968, This locomotive entered traffic as one of the first JBs in October 1965 as E6009 and later 73103. Our model represents 73968 in the condition it was first adapted to work with the new Mk5 coaches with drop Dellner coupler and two part snowploughs but still retaining 3rd rail equipment