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The Ais Gill rail accident occurred on the Settle–Carlisle line in Northwest England on 2 September 1913. Two long trains were both ascending a steep gradient with some difficulty, because their engines generated barely enough power to carry the load. When the first train stopped to build-up steam pressure, the driver and fireman of the second train were distracted by maintenance routines, and failed to observe the warning signals. The collision wrecked several carriages, which were then engulfed by flammable gas, killing 16 people and injuring 38.