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(last edited July 20, 2005) Front Page | Recent Changes | Title Index | User Preferences | Random Page | HelpIn signalling, a system to prevent the setting up of conflicting routes. At first they were mechanical, then electro-mechanical. Now they are largely computerised using a two in three voting system or similar protocol. Also note the term SSI (solid state interlocking). In the US, the term Interlocking refers to an area where junctions and signals are under the control of a signal cabin or Tower?.
