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Recommendation

Recommendation details
Output No: RR20080020
Date issued: 29 February 2008
Safety action status:
Background: Why this Recommendation was developed

Output text

Safety Issue

Considering the profile of the displaced shoulder ballast and the absence of any evidence to the contrary, it is possible that the combined effects of wind load, due to the prevailing thunderstorm conditions, and the wagons' natural oscillations while travelling, could have been sufficient to initiate the overturning of the lightly loaded, double stacked, FQWY wagons in the train.

Action taken by FreightLink Pty Ltd

FreightLink has implemented procedures to reduce the risk of wind induced derailments by ensuring the combined centre of mass of double stacked wagons is as low as possible. The gross mass of the top tier container(s) must be equal to or less than the gross mass of the bottom tier container(s).

ATSB assessment

Considering the extensive use of double stacked well wagons in Australia and the very low incidence of wind induced derailments, it is likely that FreightLinks action will reduce the risk of wind induced wagon roll-over. However, there are actions other than reducing centre of mass that may require consideration, especially avoiding double stacking two large but empty containers on any one wagon or platform.

Safety Recommendation

The Australian Transport Safety Bureau recommends that FreightLink consider further action to address this safety issue.

 
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Last update 05 April 2012