John Smatlak posted:For years I've read about early Marklin signals operated with compressed air; recently I added this interesting semaphore to my collection. To my amazement it still works! What I'd like to learn more about is the air pumps and related control mechanisms that Marklin made for these; I've included two photos I found on the internet of a signal control box (which I gather is also a pump?), but would welcome more info from someone more familiar with them. Neat stuff!
I had no idea these existed. Maybe you just blew into a little hose?
