Class (locomotive) refers to a group of locomotives built to a common design for a single railroad.

Class 84 may refer to:

The 2600 Class may refer to:

Note: "Class year" refers to the alumnus's class year, which usually is the same year they graduated.

Class 13 may refer to:

Class 26 may refer to one of several railway locomotives:

The Class 23 may refer to:

Class 87 may refer to:

In the 1980s the Class 37 locomotives were extensively refurbished - from that point 37/0 refers to the original version.

Class 1 refers to any dissection with a true and false lumen.