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They say, for two colleagues who were killed by a commuter train. the men were inspecting a section of track when they were struck by a b.a.r.t. train that was returning for maintenance. the train was being operated by non-union engineers, who b.a.r.t. officials describe as highly experienced, but union reps say they have warned b.a.r.t. about the danger of allowing manages to operate those trains. dom is live with more. officials say they have a good idea of how this happened? >> they say the four-car locomotive was being run in automatic mode when it happened around 2:00 p.m. local time on s...

Approximately 16.2 on the c-1 track. >> reporter: that's a terrible call, and the dead are identified as a b.a.r.t. employee and a contractor. the local union of b.a.r.t. says the full details are still being determined. >> it's my understanding that they were coupling a train, kekdikek connecting two cars. after that, i don't know exactly what it is. there's no gap in between the recording, so one leads into the next conversation, but i don't know exactly what was happening at the time of the accident. >> well, the national transportation safety board has sent one of its chief investigators t...