unrail

Verb

unrail (third-person singular simple present unrails, present participle unrailing, simple past and past participle unrailed)

1. (transitive) To remove the rail or railings from.
   • “You are tearing pickets from innocent fences,” said Town, and proceeded to unrail a respectable fence to procure weapons wherewith to “smash the'students' heads.”1907, Hamilton Literary Magazine - Volume 42, page 199
2. (ambitransitive, figuratively, literally) To derail.
   • If this wanton attempt to unrail or overturn the engine had succeeded, eight lives would have been sacrificed.1842, Bradshaw's Railway Gazette - Volume 2, page 152
   • The high flange of the former serves to keep the wagon, ever inclined to unrail in the curve, in the rail, while the flat rail gives the required gauge.1884, Railway Record - Volume 42, Issues 1-39, page 378