As described, a bi-stable relay. In english: a relay which uses 2 coils and remains in the last chosen position (no return spring).
Something around 12V, 2amp should do, I think.


No, but it limits the amount of wires running from the front to the rear unit to 2.


No, the relay is used to switch pickup-shoe, so current is always drawn from the front pickup shoe, independant of the direction of travel. This is handy when using stop- or braking sections in stations or in front of signals.

Nice homepage, Svein!

As I understand your site - the mono-stable relays are only for the interior lights, correct?

I don't need the interior. I just simply want to convert it, so it can run digital - where the white and red lights are changing with the direction.
In this case - I do only need one of the four "relays" you put in, - the bi-stable one, is this correct?

And as I want it only wtih the changing front/rear lights, do I need more than these current 2 wires which are already installed from the fabric between the front and rear cariages?

I am professional to forget the names of different items - the yellow/orange plate your relays are sitting at - I remember that I saw some plates like that before (with another colour in my memory) what are the 'name' of these plates?

- If you want to answer in Norwegian - you're welcome. I think it would help me a little more. ;-)

Hi all

As a special service for the Norwegian reading forum members and visitors, I have made some information about relays and bulb connections in Norwegian on my website.

Have a look at my homepage www.saebonet.com, select "digital convertions" and "hvordan koble lys".