During a 2014 trip to the UK, I went to the Bluebell Railway, south of London. This is a steam line which is frequently used in British TV and film dramasβfor instance, Downton Abbey, 102 Dalmatians, The Woman in Black, Goodbye Christopher Robin, The Innocents, numerous BBC dramas, for instance, Endeavourβduring which they change the station names.
The main station has a train shed with literally dozens of old locomotives inside.
If you're ever in London, the railway is a half hour train trip south. See website: