unrail

verb2

1. •
   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
2. •
   To derail.

   • If this wanton attempt to unrail or overturn the engine had succeeded, eight lives would have been sacrificed. — 1842