I don't know how it happened, but when DT had a rollback (or, more accurately, it just stopped in the trough), a bunch of maintenance workers got together to push it to the break. There is only one place where Disaster CAN roll back, around the satellite, and that isn't too far of a distance. And remember, there are only 10 people, as opposed to a standard train with 32!
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Disaster Transport '97 Crew
Iron Dragon '98 Crew