Protruding screws possible cause LRT wheel cracks, TSB says

By CBC News Ottawa, December 16, 2020

The Transportation Safety Board (TSB) of Canada says protruding screws may have contributed to cracks found in the steel wheels of Ottawa's new light rail trains. 

The first crack was found July 2, prompting OC Transpo to launch mandatory daily inspections that reduced the number of available trains on the Confederation Line.

Within about a week, four cracks had been found and the TSB announced it would be investigating.

(...)While noting its investigation is ongoing and other factors likely led to the cracks, the TSB said all wheels that were shipped with the jacking screws installed should be removed from the trains.

"The preliminary TSB examination results demonstrate that some wheel hub cracks may go undetected and the development of cracks in the area of jacking screws installed in the hub of resilient wheels may be more widespread than initially thought," it wrote.

"Therefore, it is suggested that OLRT and Alstom expedite the removal of all Lucchini resilient wheels that were originally installed on the OLRT LRV fleet and were equipped with jacking screws."

In September, Ottawa's transit operations director Troy Charter said all original wheels would be replaced by spring 2021. In a memo Tuesday, the city said this had happened for 13 of its 38 vehicles.

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