I have 3 of these solenoids but don't know what they are for. Not semaphores, not warning signals, just the solenoid with and extra red cable, where does it go?



Thank you

N and M identify the sockets on the back of the solenoid, correct ?
What do I plug in these two sockets ?

But the L cable where does it go ? Into a device or in a 7072 and to do what ?

Thank you

I use one of them for the power to my alpine-station helix;
When the train enters the helix going UP, a circuit-track changes the relay to power the helix with HIGH voltage.
Another circuit track at the top of the helix, changes the relay to power the helix with LOW voltage for trains going down.

On my previous layout I also used them as a kind of "1-bit memory"; Every second train would stop, wait and allow itself to be overtaken in a station.

They are extremely rugged, and have no problem with having the coils powered continuously. It gets hot, but it doesn't break! Old-school vintage analogue!

Hi
Yes, among other things you could control your 7051 magnet with it. Other applications are allow a bi-directional signaling, change the voltage when uphill or downhill
Cheers
Jean