Edit this page
(last edited July 19, 2005) Front Page | Recent Changes | Title Index | User Preferences | Random Page | HelpUsed to allow trains to run in either direction over the same section of track subject to the built-in safety systems which prevent collisions. Bi-directional signalling is very useful in releasing for maintenance a single track of a two-track railway but it is more complex and expensive to install than single direction signalling.