• WordNet 3.6
    • v derail run off or leave the rails "the train derailed because a cow was standing on the tracks"
    • v derail cause to run off the tracks "they had planned to derail the trains that carried atomic waste"
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Webster's Revised Unabridged Dictionary
    • v. t Derail To cause to run off from the rails of a railroad, as a locomotive.
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Century Dictionary and Cyclopedia
    • derail To cause to leave the rails or run off the track, as a railroad-train: as, the engine was derailed at the crossing.
    • derail To run off the track or rails.
    • n derail In railroading, a switch which is designed to divert or throw a train or car from the track or to stop its further progress. Derails are placed on sidings to prevent a ear from being moved from the siding to the line when the switch is closed; they are also used it draw-bridges and at crossings. Any emergency obstruction on a track may serve as a derail. Derails on sidings are placed beyond the clearance-point of a switch.
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Chambers's Twentieth Century Dictionary
    • v.t Derail de-rāl′ to cause to leave the rails
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In literature:

It should not be necessary to assure my readers that we acted entirely within our rights in derailing and destroying trains.
"My Reminiscences of the Anglo-Boer War" by Ben Viljoen
The method of derailing the train had been simple.
"South Africa and the Transvaal War, Vol. 2 (of 6)" by Louis Creswicke
A runaway train from San Guiseppe for Naples was derailed, owing to showers of stones from the crater.
"Complete Story of the San Francisco Horror" by Richard Linthicum
Long trains of cars have been derailed and carried great distances from the railroads.
"The Johnstown Horror" by James Herbert Walker
The circus trains ahead of the derailed one could keep on to their destination.
"Joe Strong on the Trapeze" by Vance Barnum
At the end of the last century wheels were constructed with flanges, to prevent derailing.
"The Railroad Question" by William Larrabee
He testified that he had kept the detective agencies informed as to the progress of the plot to derail the train.
"Violence and the Labor Movement" by Robert Hunter
Speaking of Detour and Derail, "I wonder," wonders A. T., "whether in your travels you ever got to Goslow.
"The So-called Human Race" by Bert Leston Taylor
All of a sudden he felt that he was being derailed.
"The Brain" by Alexander Blade
Very soon rioting broke out, trains were derailed, and men who attempted to take the strikers' places were savagely maltreated.
"The Greater Republic" by Charles Morris

In news:

The scene of the derailment today in Paulsboro, N.J.
Cleanup continues to site of NJ train derailment.
Cleanup continues to site of NJ train derailment.
Derailed freight train cars sit semi-submerged in the waters of Mantua Creek after a train crash in Paulsboro, New Jersey November 30, 2012.
Derailed freight train cars sit semi-submerged in the waters of Mantua Creek after a train crash in Paulsboro ( ANDREW BURTON, Reuters / November 30, 2012 ).
That distinction will go to Blake Griffin: The only thing that could derail him is the fact that he plays for the Clippers , who by law still lead the league in selfish veterans.
Rail workers and early Davisville residents survey the damage after a train derailed in 1894 on the line between Davis and West Sacramento, the result of sabotage during the Pullman workers' strike.
Poor trades and, in Sizemore’s case, injuries, derailed that plan.
Abbeville County is taking new steps to improve the communication between first responders after a train derailed there this March.
Abbeville County is taking new steps to improve communication between first responders and community members, after a train derailed there this March.
Federal officials estimate derailment caused $2.2M in damage.
NTSB preliminary report doesn't conclude cause in fatal train derailment.
Train derails in Ellicott City, killing 2.
PAULSBORO — Tapes of the first 9-1-1 calls reporting the Jefferson Street Bridge train derailment were released by the Gloucester County Emergency Response Center Tuesday.
A shelter in place order and an evacuation order are still in place after a blast at the site of the train derailment at Katherine Station Rd.

In science:

First, the subway control system, in which two verifiable problems, collision and derailment may happen, is specified in Lustre.
EPspectra: A Formal Toolkit for Developing DSP Software Applications
For some further derails concerning ∆E , see Terrell L.
On the Luttinger theorem concerning number of particles in the ground states of systems of interacting fermions
Since random unitary matrices provide a method of random sampling of quantum states, they are also used for investigating typical properties of physical systems when derails of the system are unknown [10, 11].
Diagonal-unitary 2-designs and their implementations by quantum circuits
To explain this point, we start by discussing what we mean by asymmetry and how it derails the second moment method.
Going after the k-SAT Threshold
For, we need only suppose that Alice measures an eigenbasis Πb = |bihb| of ρ to derail the whole program.
Information Tradeoff Relations for Finite-Strength Quantum Measurements