Starting in 1993, the Alaska Railroad ordered SD70MACs with head-end power to make them suitable for both freight and passenger service; no other railroad ordered this variant.

The EMD (Electro-Motive Division of General Motors), SD70MAC is a six-axle, 4,000-4,300 horsepower diesel-electric locomotive built from 1993 to 2004.

Dec 16, 2024 · Across the industry the most successful SD70 has been the SD70MAC. The MAC carries the same wide-cab design as the SD70M except that it also features AC (alternating …

The Alaska Railroad (ARRC) owns 28 SD70MAC locomotives, which make up more than half of ARRC’s 51-unit locomotive fleet. “SD” refers to Special Duty and “MAC” translates to “M” for …

Jul 31, 2025 · Burlington Northern Santa Fe 9400, the SD70MAC diesel locomotive that pioneered AC traction for freight service in the United States when it was built in 1993, has …

Apr 25, 2021 · EMD’s SD70MAC was the first production alternating-current traction locomotive to be delivered to a customer when Burlington Northern accepted the first of hundreds of …

Based on the pioneering AC technology first used in the SD60MAC, the SD70MAC improved upon and perfected the art of AC traction. Normal DC locomotives, like the SD70M, have …

Dec 28, 2022 · The SD70MAC was introduced in 1993 following two years of tests with four SD60MAC prototypes. It was EMD's first production locomotive with AC traction motors and, …

One glance at the design of this engine reveals the enormous technological gains in railroading. The SD70 boasts a 32-bit 16mHz control microprocessor named the EM2000.

At this time, the SD70MAC, in all of its versions, has been operated by six different railroads in a total of eight different paint schemes. The railroads that operate this locomotive span from …