http://rss.nytimes.com/c/34625/f/640350/s/464af237/sc/21/l/0L0Snytimes0N0C20A150C0A50C140Cus0Ctechnology0Ethat0Ecould0Ehave0Eprevented0Eamtrak0Ederailment0Ewas0Eabsent0Bhtml0Dpartner0Frss0Gemc0Frss/story01.htm

Positive train control, which can automatically slow trains, had not yet been installed on a critical stretch of track in Philadelphia where Train 188 derailed on Tuesday night.

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