This is a model of a small relay cabinet that would be found trackside along branch lines at crossings, which is where i measured this prototype. Since the track speeds are lower, fewer relays are needed to control the crossings and thus the need for a smaller shed. Many times there are more than one cabinet at each crossing, or the smaller shed may go alongside a larger one.
This is a very detailed model that cannot be printed in the flexible detail plastics. I would also suggest printing in the frosted extreme detail, but I understand that is a considerable amount more.