3D CAD/Printing, British and Australian railways, Quirky/unusual locomotive and stock designs, Dr Who, classic cars, and fixing and tinkering on heritage trains (when they decide to work)
It's not too different for TOCS and FOCS running old BR kit. Frequently we'd having to source spares from places like Harry Needle, refurb old parts, as well as getting parts especially manufactured as the Unipart spares run out.