| 释义 |
Class 4 may refer to: - Speed Class Rating, the official unit of speed measurement for SD Cards
- British Rail Class 04, a British diesel shunting locomotive
- Class 4 telephone switch
- Class 4, a contribution class in the National Insurance system in the UK.
- NSB Class IV, a narrow-gauge steam locomotive of Norway
- NSB El 4, an electric locomotive of Norway
- NSB Di 4, a diesel locomotive of Norway
- TS Class 4, a tram used in Trondheim, Norway
- The fourth class in terms of hiking difficulty in the Yosemite Decimal System
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