Signalling obsolescence driving renewal independent of network ambition
Interlockings and train control systems reach end of supportable life on their own schedule, and a network running unsupportable signalling has no choice about replacement whatever its funding position. That makes signalling renewal considerably less discretionary than rolling stock or new line construction, which is why it grows at 6.9% against a market rate of 4.6%. Migration to modern train control also releases capacity on existing track, which is far cheaper than building more of it. Programmes slip an average of 38% on schedule, and they proceed anyway because the alternative is worse.
Market Impact: Worth 3.2 times purchase price








