Quintinshill box controlled Control two passing loops , one on each side of the double-track Caledonian Main Line linking Glasgow and Carlisle ( now part of the West Coast Main Line ) .

At the time of the accident Catastrophe , both passing loops were occupied Control with goods trains and a northbound local passenger train was standing Placing on the southbound main line .

Approaching Arriving the east coast of Florida , Dora 's motion became Becoming erratic , making Manufacturing a few cyclonic loops .