SAN DIEGO - Police are trying to determine why a freight train was abandoned on the tracks Thursday night with its engine still running.

The 44-car train was left idling along Interstate 5 on the 1400 block of West Morena Boulevard in Bay Park at about 10 p.m. Because of the recent terrorist bombings in London, officers notified the Homeland Security Department and the FBI about the incident. Officials told NBC 7/39 that they were concerned a terrorist could have stolen the train. Investigators discovered a note inside the train that stated that the train's crew had worked their maximum hours allowed so they left the train and got a taxi to take them home. Officers interviewed two train employees about the incident.