I'm not sure that this is possible but something tells me that I have read a way of do it somewhere.

Imagine a circle of track...and a loco always running in the same direction.

An attempt to describe what I want to do.

a)I want to make a loco run over a contact track and activate something.

b)The next time it comes round and passes over the contact track nothing happens.

c)The next time it passes over a contact track I want it to do what it did in a) ie activate something

In other words the instruction is activated at alternate passes of the loco.

So I want some sort of remote switch that at each impulse flicks from one instruction to the other. Is this called a toggle switch?

I'm using remote switch 7045 elsewhere on my layout but cannot see how it could help. I'm not familiar with other versions of the remote switch.

Then I thought maybe I could do this with an old loco reversing unit?

Any ideas?

Hi Jean,

I hadn't thought of the Telex unit. As you say, it is a toggle switch.

Thanks,

I'll try

Michael

...

This can be done in several ways, I think.
You can use the Märklin UFS relays as a "memory-bit" and make a toggle electro-mechanically;



Normally I make my systems with 24V industrial strength relays, where the coils can be powered on continuosly, but I think this plan is correct for track-contacts and Märklin 16V bistable relays.
It whould work correctly with both slider and wheelsets operated contacts, as long as the distance between each track-contact is more than a train-length.

Forget about the "direction of travel"; This will work in both directions...