WordNet (r) 3.0 (2006):

railroader
    n 1: an employee of a railroad [syn: trainman, railroader,
         railroad man, railwayman, railway man]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "railroader":
   baggage man, bakehead, brakeman, brakie, butcher, conductor,
   dispatcher, fireman, footplate man, guard, lineman, porter,
   railroad man, redcap, smoke agent, stationmaster, stoker,
   switchman, trainboy, trainman, trainmaster, yardman, yardmaster