I worked in a factory that still had an internal railway into the '90s, though it was disconnected from the mainline in the '70s, I think.
This loco, now at Foxfield Railway was one of the last pair that ran in there, along with a battery electric.
It was an important skill to be able to avoid twisting your ankle in the slots where the track was embedded - not something that I always managed to achieve, especially on the outdoor sections in the winter...