scope:

Typical Circuits are best practice and should be applied to all new works and alterations to existing installations. Typical Circuits are not mandatory and users should check compliance to current Railway Group Standards, Railway Industry Standards and Company standards before implementing the design.

Any deviation from typical circuits should be justified and documented by the relevant signal designer. There is no need to follow the established variation process.

Purpose

The purpose of this document is to provide signal engineers a standardised approach to signalling design. This prevents additional costs being incurred when a design solution already exists and assists maintainers when fault finding. The document includes a listing of typical circuits for signalling and level crossing applications.