How to Measure and Define Lead and Lags

Document status:

Active

Format:

Electronic (PDF)

Delivery time:

10 minutes

Delivery time (for Russian version):

200 business days

SKU:

PDF ONLY

Introduction

This Track Work Instruction covers how to measure and define ‘leads and lags’ in rails.

‘Leads and lags’ are the amount by which a rail across a four-foot is either ahead of, or behind, the opposite rail.

See also the separate instruction:

TWI 3P067 How to plan & organise rail adjusting

This TWI refers to jointed track, generally installed prior to the introduction of CWR and pre-decimalisation.

NR TWI 3P061 ISSUE 1 PDF