The freight train that derailed yesterday morning in Ellicott City, Md. was traveling at the approved speed of 25 miles per hour before the crash, a federal investigator reviewing the incident told reporters today.

Twenty-one of the train’s 80 cars derailed as it crossed a bridge over the Howard County town’s Main Street, killing two young women who were sitting on the bridge, and spilling mountains of coal on the street below.

Jim Southworth, an investigator for the National Transportation Safety Board, said it was still premature to determine if the presence of Elizabeth Conway Nass and Rose Louese Mayr on the bridge was a contributing factor in the crash, according to the Associated Press. Nass and Mayr, both 19, were crushed by the coal spilling from the overturned cars moments after they tweeted about sitting on the bridge while sharing a late-night drink.

Southworth, the AP reports, said that train’s brakes kicked in automatically instead of being applied by the three-man crew, which included an engineer-in-training at the helm at the time of the derailment. Both of the train’s two locomotives stayed on the tracks, Southworth said.

The CSX train was en route from Grafton, W.Va to its final stop in Baltimore.

Recovery from the crash will still take a few more days, but there has been considerable process. The AP reports that 19 of the 21 cars that derailed have been removed. Meanwhile, NTSB investigators will be removing the stretch of rail where the incident occurred and reassembled in another location for inspection.