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Controlling 2 Traintech signals from one switch - is this possible?

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I'm at a point in my layout construction where I am starting to think about signalling.  It's an 80s BR Blue era shunting layout with trains arriving and departing via a single line from the off-scene main line. 

Trains in the arrival/departure 'kickback' siding can either return to the main line or take the diverging route of a turnout which leads to the yard reception siding. 

I am planning on having two signals  protecting this turnout: a 2-aspect colour light which allows access back to the main line; and a ground signal which allows access into the Yyard. 

Bearing in mind that both lights can be red at the same time, but only one can be green/white, could I use a single 3-pole centre-off switch to control these signals?  I am thinking the central position could be 'both red', switch up for 'clear to main' and switch down for 'clear to yard' ?

I realise that I could spend a couple of quid and just by two switches, but I seem to like making things difficult for myself on this layout build. 

Any advice would be appreciated. 

Thanks 

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Its simple with a two-pole (or greater) rotary switch.  Needs minimum of 3 positions. 

 

A 2-pole 6-way would do, you typically set a limit tab-washer on the shaft (supplied with switch) to set it to three positions only. 

 

Wired thus:

 

1415197749_Annotation2020-07-11113034.png.25f8c38b59ac7b0fad79e5c5afb6852f.png

 

It could be done with a centre-off switch, but the stuff behind it might get more complicated.  I can see how to do it with two relays controlled by the centre off switch, with one relay energised in each direction. 

 

 

 

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And with colour light signals it would not normally be a GPL in use but a subsidiary mounted on the main signal post and showing the white lights only, no red.

Rather than having a 3 way switch that allows you to set the wrong aspect why not use a normal two way switch and select the aspect by the point position, preventing mistakes?

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Thanks for the comprehensive information on the shunt signal.   I am quite partial to a feather signal but I suspect it would not be prototypically correct, bearing in mind the next 'signal' on the diverging route (if it were visible and not beyond the scenic break girder bridge ) would the red light on the buffer stop?

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Posted (edited)

You can get a type of double pole switch which is an ON-ON-ON type and this will do what you need. It is basically two 2-way switches where in the middle position one is one way and the other is the other way so they can both be on at the same time.

 

Example switch here:-

https://uk.rs-online.com/web/p/toggle-switches/7347202/ 

Edited by Suzie

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1 hour ago, Suzie said:

You can get a type of double pole switch which is an ON-ON-ON type and this will do what you need. It is basically two 2-way switches where in the middle position one is one way and the other is the other way so they can both be on ant the same time.

 

Example switch here:-

https://uk.rs-online.com/web/p/toggle-switches/7347202/ 

 

Thanks. Believe it or not, I have a HND in Electrical and Electronic Engineering, but I got that over 30 years ago :o and have not had much need for it until I started building the layout about 18 months ago.  I will look into these switches.  Thanks again. 

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