scope:

The standard covers:

a) principles for new designs of track components and configurations;

b) design of layouts;

c) requirements for the use of current standard designs of track components and configurations;

d) requirements for the following track support features: ballast, shingle, formation, sand blankets, geosynthetics, second-stage concrete, transition slabs and drainage systems.

The requirements in this standard apply to the upgrading and renewal of existing track only to the extent reasonably practicable.

Where it is mandatory that any of the supporting information in Section 5 of this standard is to be applied, the appropriate requirement is set in Section 3.

This issue of the standard replaces 1-157 A2 and parts of 1-160 A2 and 1-161 A2.

Purpose

This standard identifies the performance, design and configuration requirements for new track components, configurations, layouts and track bed.