Transportation
- Travel class, a quality of accommodation on public transport
- Class (locomotive), a single design of a locomotive as assigned by the railroad
- Classification of United States railroads:
- Class I railroad
- Class II railroad
- Class III railroad
- Class rating, an allowance to fly a group of aircraft that require training common to aircraft within the group
- Vehicle size class, a way of classifying cars
- Ship class, group of ships of similar design
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