The Century 424 was a four-axle, 2,400 hp (1,790 kW) diesel-electric locomotive.

190 were built between April 1963 and May 1967.

Cataloged as a part of Alco's Century line of locomotives, the C424 was intended to replace the earlier RS-27 model and offered as a lower-priced alternative to the C425.

Montreal Locomotive Works also built this locomotive as MLW Century 424.

This diesel locomotive-related article is a stub.