scope:

This document defines the selection criteria for two or three aspect banner repeaters and also the required controls in normal and degraded working. It does not define the criteria for selection of signals which require a repeater nor the positioning of the repeater as these are defined elsewhere.

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 provision and application of two and three aspect banner repeaters (three aspect also known as green banners) 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).