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Derail is both Transitive and Intransitive Verb
Derailment is both Countable and Uncountable Noun
If a train derails, or is derailed, it comes off the railway tracks
Cargo train derails in Kenya slum
(Source: CLD- 2nd Edition)
A cargo train derailed in a sprawling Nairobi slum, crashing into makeshift homes where scores of people are feared trapped. (The Straits Times)