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Preset Shunt

Preset Shunt

A preset shunt is a ground position shunt signal that automatically shows a proceed aspect when a route is set from one main signal to another where the ground position shunt signal lies within that route. The preset shunt will be proved alight and “off” ("not on" on some older installations) before the main entry signal will clear.

In some areas also known unofficially as a "running dummy".


Last edited by GeoffM on 15/09/2016 at 03:00