# Class 1

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**Class 1** may refer to:

- [Class I railroad](/source/Class_I_railroad), a term used in North American railroad size classification
- [Class 1 Touring Cars](/source/Class_1_Touring_Cars), an FIA classification for cars in motor racing
- [Class 1 World Powerboat Championship](/source/Class_1_World_Powerboat_Championship)
- [Classes of United States senators](/source/Classes_of_United_States_senators)
- [SCORE Class 1](/source/SCORE_Class_1), unlimited off-road racing buggies
- The first class in terms of hiking difficulty in the [Yosemite Decimal System](/source/Yosemite_Decimal_System)
- A contribution class in the [National Insurance system](/source/National_Insurance#Class_1) in the UK
- An IEC protection class in the [electrical appliance manufacturing industry](/source/Appliance_classes#Class_1)
- A class in [laser safety](/source/Laser_safety#Class_1)
- [HAZMAT Class 1 Explosives](/source/HAZMAT_Class_1_Explosives)

## See also

- [Class I (disambiguation)](/source/Class_I_(disambiguation))
- [Class 01 (disambiguation)](/source/Class_01_(disambiguation))
- [First class (disambiguation)](/source/First_class_(disambiguation))
- [NSB El 1](/source/NSB_El_1), an electric locomotive of Norway
- [NSB Di 1](/source/NSB_Di_1), a diesel locomotive of Norway
- [Type 1 (disambiguation)](/source/Type_1_(disambiguation))

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Adapted from the Wikipedia article [Class 1](https://en.wikipedia.org/wiki/Class_1) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Class_1?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.