The Denver Post: When a Regional Transportation District light rail train ran off the tracks in southeast Denver last year, agency officials issued public service alerts calling it a “disabled train” and, 14 months later, still use that term to describe what happened.

But state regulatory documents show the derailment occurred after a steel wheel broke apart and that, after the train operator radioed supervisors, the crippled train kept rolling through RTD’s Yale Station before stopping near Hampden Avenue where tracks dip ahead of an overpass.

Train wheel failures can be deadly, as seen in 1998 near Hanover, Germany, where a crack in steel caused a high-speed train to derail and crash into an overpass, which collapsed, killing 101 people.

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