I must admit I don't actually know! I'm thinking the same as a standard shunt signal, but with white and yellow lights when "on" and the usual double white at 45 degrees when "off" - but I'm not so sure.
On the IECC it shows solid yellow when on and solid white when off. The one at Dagenham is UR1146R - it's on the down platform (overhead gantry IIRC) should you happen to wander that way.
Geoff M.
On the IECC it shows solid yellow when on and solid white when off. The one at Dagenham is UR1146R - it's on the down platform (overhead gantry IIRC) should you happen to wander that way.
Geoff M.