2-4-0

plural 2-4-0s

1. Under the Whyte notation system, a steam locomotive that has two leading wheels followed by two sets of coupled driving wheels, and no trailing wheels.

   1 more example

   As we stood waiting for the departure time with the setting sun twinkling on the great brass dome of our 2-4-0, the sound of church bells was the only one apart from the measured tread of the guard slowly pacing towards his van, and, standing at an open window, I more than once heard the fireman's "Right away!" to his mate in acknowledgement of a desultory wave of the unfurled green flag.

   1955 January 28, R. S. McNaught, “From the Severn to the Mersey by Great Western”, in Railway Magazine, page 19