derail

from WordNet (r) 3.0 (2006)

derail
    v 1: cause to run off the tracks; "they had planned to derail
         the trains that carried atomic waste"
    2: run off or leave the rails; "the train derailed because a cow
       was standing on the tracks" [syn: {derail}, {jump}]

from The Collaborative International Dictionary of English v.0.48

Derail \De*rail"\, v. t. [imp. & p. p. {Derailed}; p. pr. & vb.
   n. {Derailing}.]
   To cause to run off from the rails of a railroad, as a
   locomotive. --Lardner.
   [1913 Webster]

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