scope:

Introduction

This Track Work Instruction covers the maintenance of transitions on curves.

A transition is the length of track joining two sections of track with differing radii. In their commonest form they join straights to curves - but they also join curves to curves.

Transitions also exist between reverse curves, which may or may not be provided with short straights between the two 'halves'.

See also separate instructions:

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

TWI 3T004 How to remove an overshot curve

TWI 3T010 How to set out a curve

TWI 3T024 How to understand the basics of the curving rules

TWI 3T030 How to maintain a high speed curve