NR TWI 3B021 ISSUE 1 PDF

Introduction

This Track Work Instruction covers the maintenance of track where ballast depths are less than standard. This is likely to be on bridge decks but can also occur within tunnels, over pipes or arch bridges or where ballast depths required by the standards are unattainable.

See also separate instructions:

TWI 3B001 How to remove contaminated ballast

TWI 3B010 How to assess ballast condition

TWI 3B015 How to ballast glue