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Australian commuter train crashes into station
If you wish to see vision of the aftermath of the incident you may like to go to this link on youtube ; http://www.youtube.com/watch?v=hZY-tW5J2zc
There are several other stories on this site, but they are speculative rather than factual.
Human error for sure. Wither poor/lack of maintaince, no proper air test, or excessive spped.