Police say the two women killed in a Maryland train derailment were 19-year-old college students.

Elizabeth Conway Nass, 19, was going to be a junior at James Madison University. She was with Rose Louese Mayr, 19, who was a student at the University of Delaware.

Nass tweeted less than half an hour before the incident that they were hanging out on the Ellicot City, Md. sign.

The CSX train hauling coal derailed around midnight Monday and fell from a bridge near Baltimore, killing the students who were on the tracks and crushing vehicles in a parking lot.

Authorities say 21 of the train's 80 cars flipped over. Cranes were brought in Tuesday morning to remove train cars from the vehicles at a county-owned lot so they could be searched for other potential victims.

CSX spokesman Bob Sullivan said that the train was traveling from Grafton, W.Va., to Baltimore. The National Transportation Safety Board was investigating.