Class 01 may refer to:
British Rail Class 01, a class of post-war British 0-4-0 diesel locomotive designed for use on tight curves and limited clearances British Rail Class 01/5, encompasses a variety of privately owned shunting locomotives DRG Class 01, a class of German standard steam locomotive designed between the wars for express train services DRG Class 01.10, a later, more powerful version of the DRG Class 01 above first delivered in 1939 Class 01, in the electrical Appliance classes
See also Class 1 (disambiguation) Class I (disambiguation)