Not having any expertise with trains, the engine says CSX on the side, and trains aren’t known for randomly derailing. Either the axle broke or the train was going too fast or the track had a problem, but all I can say for sure (as a layman) is the train with CSX emblazoned on the side damaged the footbridge. No one was hurt, so any liability will be limited and the responsible party can be determined later. CSX should get a crew out there pronto and repair the bridge. Have a big bridge reopening ceremony this spring with the mayor of Harpers Ferry and smiling children.