The Signalling Record Society
ELR to RailRef Correlation - ELR Codes V
This page should be regarded as “Work in Progress”. The
The first British 4-aspect colour light signals read, from the top: Green, Yellow, Red, Yellow.
Signal Fact 20
This was later changed to Yellow, Green, Yellow, Red so that snow falling on the hood of the bottom yellow aspect did not build up and obscure the red aspect directly above.