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
Transport function: Rail: Passenger - metropolitan
Background: Investigation Report RO-2016-002
Issue release date: 16 May 2018
Current issue status: Safety action pending
Issue 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.

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 number: RO-2016-002-NSA-006
Action organisation: Metro Trains Melbourne (MTM)
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.

Additional correspondence

Response date: 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.

Last update 30 July 2018