The ON indication shows a red and white light side by side. The OFF indication shows two white lights at 45 degrees. The following photos show some of the more modern colour light signal designs used in Britain today. This page offers an overview of the more common types of signals seen on UK railways but it is not a comprehensive list. There are many more varieties and local variations.
More information is available from the written sources mentioned below.
The Signal Box - Here you will find a good selection of the many varieties of semaphore signals on UK railways. Junction Signalling - A page describing the approach control of junction signals in the UK by Clive Feather. End To the Top of this page To the Railway Technical Web Pages Home Page and Contents List . Contributions from professionals or transportation experts are welcomed. If you would like to use any part of this page for publishing or commercial reasons, please e-mail me .