A warner route is a specific type of route provided at some signals, selected by the Signaller, where the full overlap of a signal may not be available for some reason. A warner route can be "stepped up" to a full route by setting the onward route from the exit signal, but cannot be stepped back down again.
When selected, the signal in rear will only clear once a timer on the berth track circuit has been satisfied. This is to ensure that the train is under control as a mitigation against the consequences of a signal passed at danger into the reduced overlap.
In SimSig, a yellow triangle at the exit signal denotes a warner route, and the overlap will be of a reduced length compared with the normal full overlap that would apply.
Last edited by GeoffM on 15/09/2016 at 03:00