Quote Originally Posted by The Gresley Luthier View Post
Just had a look at those PILZ relays, a bit steep for me.

Ray
There's a couple on eBay for around £20 also there are others such as Telemecanique Preventa.
My background is electrical by the way,
I think you need to develop a schematic before deciding what is required.. After that you need a 'box' to put it all in so a scale layout drawing is also required.