The narrow footway built along the exterior of a locomotive to allow crews to inspect and service the equipment. On steam engines, it sits above the driving wheels to provide access to the boiler and running gear. On diesel locomotives with a traditional hood design, it runs along the sides to let mechanics reach the engine doors safely.
Heard on the job
Watch your step on the running board, she's slick with oil this morning.
Insider tip
Crews are strictly forbidden from walking on the running board while the locomotive is moving unless specific safety protocols are met.