scope:

The requirements apply equally to Network Rail and its approved contractors.

This specification applies to all switches in Network Rail's permanent way that may at any time or circumstance be used in a facing direction (except as noted below).

The principals of this specification shall be applied to all types of switch machining in both bullhead and flatbottom rail sections.

The switch wear gauge may only be used on chamfered and undercut switches.

The requirements do not apply to:

• catch points

• the switch half sets of trap points which are in the open position for ordinary running

• switch diamonds

Purpose

Facing switches require robust inspection procedures that drive timely maintenance intervention that will:

• minimise the risk of derailment

• maximise the asset life

• deliver good operational availability.

This specification describes the inspection regime, monitoring procedures, immediate actions and essential maintenance to be undertaken at switches to reduce the risk of derailment.

It identifies the particular derailment hazards associated with switch wear and damage and the remedial measures necessary.