The D.C. Metro train that derailed near Arlington Cemetery station last week, causing commuter chaos in the process, had derailed twice previously that same day, The National Transportation Safety Board announced Monday.

The Washington Metropolitan Area Transit Authority announced Sunday evening a dramatic 60% cut to its railcar fleets, saying it would run only 40 railcars beginning Monday, in response to the accident on Oct. 12, with NTSB officials warning that the incident could have been “catastrophic” at a Monday press conference.