Not sure if this is the right subforum to post this in, but does anyone have any info on this? One would assume this is a replica steam engine rather than something that Tom Cruise "borrowed" from the National Railway Museum. 
www.bbc.co.uk


Mission: Impossible films Derbyshire quarry train crash
Crews had been building the set for months and the nearby village had seen lorry-loads of props appearing.

A scene involving a steam locomotive crashing into a quarry for the latest Mission: Impossible film has been filmed in Derbyshire.
The scene was shot at Stoney Middleton - where teams had been building the set for months - on Friday, with the black train plunging from a track on a cliff.
Local photographers posted images of the moment from the latest Mission Impossible film on social media.