In an early PostWar collection the modular group received in donation, there was a metal tunnel with red/green warning light and some kind of track actuator. No markings. I'm stumped.
To date the collection, it contained a 675 steam freight set from 48, a 250 watt ZW and an AA Santa Fe F3 numbered for the early ones, 2333.
Any help in identifying it is greatly appreciated.......
Peter