scope:

Introduction

This Track Work Instruction covers how to deal with a bank slip that is showing, or has shown, signs of slight movement. The movement is likely to be small and intermittent - not enough to prompt a full engineering emergency. This TWI explains how to keep traffic moving with the risks kept to the lowest practicable. Some slip sites have been active for many years - eventually though, the rate of deterioration MAY accelerate enough to cause traffic disruption.

See also separate instructions:

TWI 3G001 How to decide on a differential speed restriction

TWI 3G014 How to manage track under OLE

TWI 3G044 How to manage a watchman

TWI 3G083 How to decide on whether to use a watchman

TWI 3G111 How to arrange an emergency

TSR TWI 3L002 How to manage a developing cutting failure