That got me thinking about those armoured cars adapted to run on rails and the purpose-built self-propelled armoured rail vehicles. I suppose patrolling railway lines is a form of inspection… @Salekhard has just posted photos of some of these on his thread Museum of Military Equipment (Verkhnyaya Pyshma, Russia) - #100 by fromSalekhard.
The company UM-MT manufacture a number of these in 1:72.
Regards,
M