scope:

This specification applies to all signalling schemes and detailed design where new signals are altered or introduced. The requirements apply to colour light signals only.

The plating of signals is specified in Section D110.

The term button includes an icon or other control device fulfilling the same function.

Purpose

This section forms part of the Signalling Principles Handbook (NR/L2/SIG/30009) and is to be read in conjunction with the other sections of the handbook.

This section details Network Rail's policy on the control of signals and comprises mandatory sections, statements of good practice (which shall be followed unless an alternative can be demonstrated to be beneficial to the company and no less safe), and guidance on historical practices (which are not to be applied to new works but provide information on previous standards or their interpretation.