The Washington Post is reporting that this morning’s Red Line train derailment happened “after a safety device automatically engaged and stopped it because it had crossed from its own track and was headed to the opposite track, into the path of oncoming trains.” So that means there wasn’t anything wrong with the rails or the train that caused the derailment. Rather, there was something wrong in that the train, for reasons not yet known, moved over to the pocket track, where it should never have been. “Both the train operator and the downtown controller responsible for that section of the Red Line were placed on administrative leave and will undergo drug and alcohol testing, as is standard Metro procedure,” WaPo says.