Hoo, boy -- if you thought that it had already been a laborious weekend for Metro, you ain't seen nothing yet. WMATA isn't taking too kindly to the Post's big report this morning, an expose about the previous failures of Metrorail's much-maligned crash avoidance system. The Post's report leads with a terrifying story about a 2005 incident in which not two, but three trains' avoidance systems failed, and gut feelings were the only thing separating Metro from having a three-train, rush hour pileup between Rosslyn and Foggy Bottom, underneath the Potomac River:

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