| London Underground Railways Signalling is a subject in its
own right, and it can be a fascinating subject to follow up. The underground system is
made up of the following LU Signal Box and IMR*s - Interlocking Machine Rooms.
Here are the codes for all London Transport
lines at present, plus some past codes - most codes were just single letters originally
and later began to be prefixed with another letter (usually the line initial) for more
precise recognition - all codes in this list have been verified to be correct.
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