WordNet (r) 3.0 (2006):

yardman
    n 1: worker in a railway yard
    2: a laborer hired to do outdoor work (such as mowing lawns)

Moby Thesaurus II by Grady Ward, 1.0:

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