scope:

Introduction

This Track Work Instruction gives particular guidance on the maintenance of curves on high line speeds, which do not use the system of absolute track geometry. Network Rail Company Specifications lay down the tolerances relating to line speeds and must be followed according to the appropriate speed band and line category.

See also separate instructions:

TWI 2T001 How to permanently mark out a curve for tamping

TWI 3T004 How to remove an overshot curve

TWI 3T005 How to design sluing

TWI 3T010 How to set out a curve

WI 3T023 How to maintain a transition