The Manchester Science Museum has a lot of interesting stuff, but the one thing I remember from my visit, maybe 20 years ago, is that locomotive. Not only huge, not only articulated - which I'd never seen before - but narrow guage (3'6")! Not something I expected to find in a museum mainly (then) dedicated to aircraft. It was parked in the corner of a shed, as I recall. As the wiki article says, it can negotiate a 275 foot radius curve.

The museum is on the site of Liverpool Road station, one end of the Liverpool and Manchester Railway, of Stephenson's Rocket fame, and one of the first (but not the first - unless you only count steam loco-hauled) passenger railways.

https://en.m.wikipedia.org/wiki/Science_and_Industry_Museum