Interlocking

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In 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". [[Tower]].