scope:

Introduction

This Track Work Instruction covers how to manage alignment faults.

Definition: An alignment fault is 'where there is deformation of the track which does not necessitate any emergency remedial works to a running line under cover of either a temporary speed restriction or a closure of the line'.

The faults considered in this TWI are significant isolated features rather than general poor alignment.

The word buckle is often wrongly used to describe a 'misalignment', the term 'alignment fault' is used here to describe a track deformation, which does not need emergency remedial work.

N.B. An alignment fault that occurs in sidings or whilst any track is under possession is not regarded as a track buckle. See also separate instructions:

TWI 2P035 How to maintain steel sleepered track

TWI 2T003 How to maintain alignment

TWI 2T023 How to repair alignment faults TWI 3B013 How to manage subsidence

TWI 3C037 How to design an alignment scheme TWI 3P013 How to determine CRT

TWI 3P017 How to manage stressing records