shunter

from WordNet (r) 3.0 (2006)
shunter
    n 1: a small locomotive used to move cars around but not to make
         trips
from The Collaborative International Dictionary of English v.0.48
Shunter \Shunt"er\, n. (Railroad)
   A person employed to shunt cars from one track to another.
   [1913 Webster]
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