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(last edited July 20, 2005) Front Page | Recent Changes | Title Index | User Preferences | Random Page | HelpThe system in railway signalling whereby a route which has been set up for an approaching train is electrically and mechanically locked as the train approaches and while it passes through the route. The route is secured by the control system which prevents any conflicting routes being set up or signals being cleared. It is additionally secured by the passage of the train through the track circuits of the route concerned.
