EMD GP60M

The EMD GP60M was a specialized variant of the GP60 road switcher, built exclusively for the Atchison, Topeka and Santa Fe Railway in 1990. All 63 units, numbered 100 through 162, were delivered between May and September of that year, making the production run both brief and concentrated. The GP60M was distinguished from the standard GP60 by its North American Safety Cab, a wide-nose cab design that offered improved crew protection and ergonomics compared to the traditional narrow cab arrangement. No other railroad purchased units from the GP60 series fitted with this cab style, making the GP60M unique among EMD's four-axle offerings of the era. The GP60Ms arrived on the Santa Fe dressed in the road's celebrated "Super Fleet" Warbonnet paint scheme, a bold red and silver livery that had been revived to mark a new era of premium intermodal service. As the first newly delivered locomotives to wear this updated scheme, the GP60Ms became closely associated with Santa Fe's high-profile marketing efforts during the early 1990s. Their assignment to fast intermodal trains gave them considerable public visibility during their Santa Fe careers. When the Burlington Northern and Santa Fe merger was completed in 1995, the GP60Ms passed into BNSF ownership along with the rest of the Santa Fe fleet. Most of the units continued working under the new railroad, though as higher-horsepower six-axle power became increasingly dominant in mainline service, the four-axle GP60Ms were gradually reassigned or retired over the following decades. Their legacy is tied to the final chapter of EMD's Geep lineage, as the GP60 family represented the last new four-axle road locomotives the builder would produce in the traditional sense.

The GP60M was powered by EMD's 16-cylinder 710G3B diesel engine, producing 3,800 horsepower and driving the locomotive through a conventional DC traction system. The locomotive rode on a B-B wheel arrangement, meaning two two-axle trucks, which kept the overall axle count low relative to the six-axle units that were becoming the industry standard for heavy freight work. The GP60 series shared its frame with the GP59, and the overall length of the locomotive was 59 feet 9 inches, with a fuel capacity of approximately 3,700 US gallons. One of the more notable engineering advances found across the GP60 family was the integration of three onboard microprocessors, housed behind cabinet doors at the rear of the cab, which handled monitoring and management of engine functions, cooling systems, and various control operations. This arrangement replaced a substantial number of discrete wiring circuits and relay components that had characterized earlier EMD designs, reflecting the broader shift toward electronic control systems in third-generation diesel locomotives. On the GP60M specifically, the North American Safety Cab introduced a slightly offset front headlight placement to accommodate a full-width nose door, a practical concession to the wider cab structure that became a subtle identifying feature of the variant.