NR TI 141 ISSUE 1 PDF

Category Mk2B, AL3A and WS3A SSI schemes.

Purpose

This TI is to give notification of recently issued MPM Mod States that amend those listed in NR/GN/SIG/17901 Issue 3, noting the requirement that all three Interlocking MPMs within a Central Interlocking are of the same type and modification state, and running the same version of main, trackside communications, and internal communications software. This is to avoid possible timing issues that may otherwise develop in the timing critical triplicated system.

This TI supersedes NB 077 which is withdrawn.