Trains: another from my visit to the Romney Hythe and Dymchurch Railway.
This one-third scale live steam railway operates as a full public railway; as such they must adopt the same safety precautions and risk management systems as "the real thing". This, of course, is what signal boxes used to look like across the rail network, and you can still see many such buildings alongside train tracks to this day (either now out of use, or full of computer equipment!).
@sarahlth I struggled a bit with the windows and light. When taking the shot I thought I would be able to recover some of the detail in post-processing, but alas not easily and I didn't want to spend too long faffing about with it. I did crop down from the top on the full image, and left what I felt was a reasonable margin to give the signal box interior some relativity. I could have done more but felt the No 5 Handle would then have looked a bit odd. Thanks for the critique - always welcome.