So, in a moment of extreme nerdiness whilst watching the 28 Years Later trailer, I wondered if the abandoned train featured in a shot was just a product of the arts department or if it actually was a real locomotive.

And it turns out it is real!

Apparently Class 31 unit 31542 is the last remaining commercially operated locomotive of the class and it appears the loco was specifically repainted for use as a movie prop!

And now you know too!