derailment

from WordNet (r) 3.0 (2006)
derailment
    n 1: an accident in which a train runs off its track
from The Collaborative International Dictionary of English v.0.48
Derailment \De*rail"ment\, n.
   The act of going off, or the state of being off, the rails of
   a railroad.
   [1913 Webster]
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