The document below is just a basic appreciation of the Siemens type Modular Signalling and Westrace MKII interlocking that you may find useful if you wanted an insight to it or as pre-course reading.

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This document shows the state of the many LED indications as a guide for carrying out maintenance or faulting finding duties.

Modular signalling LED Indications.pdf Modular signalling LED Indications.pdf
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