First Generation Diesel

The First Generation Diesel Era, roughly spanning the 1950s through the mid-1970s, represents the full flowering of diesel locomotive technology and the last great era of railroad diversity before the merger movement consolidated the industry.

First-generation diesels were designed as direct replacements for steam locomotives. Cab units like the EMD F7 and E8 offered streamlined styling and were typically used in multiple-unit consists for passenger and fast freight service. Road switchers like the GP7 and GP9 provided versatility, able to work freight, passenger, and switching duties.

This was the era of distinctive railroad paint schemes—each major railroad had its own colors and livery, creating a rainbow of variety. The Santa Fe Warbonnet, Southern Pacific Black Widow, Baltimore & Ohio Capitol Dome, and many others made railfanning exciting and colorful.

The era ended as first-generation power wore out and was replaced by more powerful second-generation locomotives. Many railroads merged, and the distinctive paint schemes gave way to simpler, more utilitarian liveries.