NR TWI 3P074 ISSUE 1 PDF

Introduction

This Track Work Instruction covers how to maintain longitudinal timbers.

The timbers are commonly referred to as waybeams or wheel timbers.

There are many types of longitudinal timbered bridges on the network and, as a result, many types of fixing systems.

This TWI outlines some of the more common types of systems and shows what you need to do to prevent deterioration.

See also the separate instruction:

TWI 2P021 How to recognise longitudinal timber deterioration