Superelevation is where one rail is higher than the other rail during a curve. Similar to the bank you would see on a NASCAR racetrack during turns in the track. Superelevation helps the train turn while minimizing strain on the outside rail and the train wheels. If the track is not superelevated enough, or the train is going too fast for the amount of superelevation, then there is too much strain on the outside rail and the outside wheels of the train and you would call the condition “cant deficient” because there is not enough of a “cant” in the track to balance the forces.
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