Class 4 may refer to: British Rail Class 04, British diesel shunting locomotive BR Standard Class 4 4-6-0, British steam locomotive BR Standard Class 4 2-6-0, British steam locomotive BR Standard Class 4 2-6-4T, British steam locomotive Class 4 telephone switch Class 4, contribution class in the National Insurance system in the UK. NSB Class IV, Norwegian narrow-gauge steam locomotive NSB El 4, Norwegian electric locomotive NSB Di 4, Norwegian diesel locomotive SCORE Class 4, off-road racing vehicles Speed Class Rating, official unit of speed measurement for SD Cards TS Class 4, a tram used in Trondheim, Norway Class 4 truck, US truck class for medium trucks, up to 16,000 pounds weight limit The fourth class in terms of hiking difficulty in the Yosemite Decimal System Missouri Class 4 city See also Fourth class (disambiguation) Delta class (disambiguation)