The difference between Crack train and Express train
When used as nouns, crack train means fastest express train between two stops, whereas express train means a train (either the service or the train itself) making limited stops.
check bellow for the other definitions of Crack train and Express train
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Crack train as a noun (US, dialect, dated):
Fastest express train between two stops.
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Express train as a noun (rail):
A train (either the service or the train itself) making limited stops.