A colloquial name for the Electro-Motive Division GP series of diesel-electric locomotives. Starting with the GP7, these versatile four-axle units were designed for both mainline freight and yard switching duties. Crews still use the term for any older, four-axle EMD unit assigned to local runs or yard work.
Heard on the job
The yardmaster wants us to grab that old Geep and pull the bad order cars off track four.