The derailment of a Blue Line train Tuesday night occurred near a section of track where a faulty piece of track equipment had been temporarily repaired earlier that evening.

Track crews had fixed a faulty switch, clamping it into position, Metro spokesman Dan Stessel said. A track switch is equipment that controls the path of trains where two sets of track diverge. Stessel would not say how close the derailment was to the actual switch, only saying it was “proximate.”