Rail safety issues and actions

Track geometry standards

Issue number: RO-2016-002-SI-04
Who it affects: Owners and operators of passenger rail services in Victoria
Issue owner: Metro Trains Melbourne
Operation affected: Rail: Passenger - metropolitan
Background: Investigation Report RO-2016-002
Date: 16 May 2018

Safety issue description

The network’s track geometry standards were probably unsuitable for small-radius Broad-Gauge curves. A combination of track geometry irregularities had increased the probability of flange-climb at several locations on the small-radius Rushall curve.

Proactive Action

Action organisation: Metro Trains Melbourne (MTM)
Action number: RO-2016-002-NSA-006
Date: 16 May 2018
Action status: Monitor

Metro Trains Melbourne (MTM) has undertaken to review, and update as required, its network maintenance standards applied to small-radius curves and specifically maintenance tolerances on those geometric irregularities that increase the probability of flange-climb derailment.


Date received: 31 August 2018
Response from: Metro Trains Melbourne
Action status: Monitor
Response text:

Modelling to update geometry tolerences

MTM is examining using modelling to simulate the risk of flange-climb derailment for different track geometry conditions on small-radius curves, and the potential for this modelling to support an informed revision of track geometry tolerances.

Current issue status: Safety action pending
Status justification:

The safety action taken by MTM in combination with other actions pertaining to track maintenance should reduce risk associated with the safety issue.

Last update 30 July 2018