Athearn announces first Ferromex and UP AC4400CW Genesis releases

Athearn’s Genesis AC4400CW release landed on the one thing modern HO modelers actually need from a GE six-axle road unit: roster flexibility. The new run added the 2025-and-later Ferromex version in three road numbers and Union Pacific No. 6344 in a distinctive gray scheme, with illuminated number boards and ground lights giving the models the kind of low-light detail that makes a late-era freight consist look finished instead of generic.

That matters because the AC4400CW was never a one-note locomotive. GE built the 4,400-horsepower road diesel from 1993 to 2004, and reference data lists 2,834 examples built with a 5,000-gallon fuel tank and production stretching from June 1993 into the modern freight era. It became one of the most recognizable AC-traction power plants in North America, which is exactly why it keeps showing up in intermodal, manifest, stack, and cross-border assignments on layouts that aim to look current rather than nostalgic.

Athearn leaned into that variety with the Genesis tooling, calling out three cab variations, illuminated ditch lights, see-through cab windows, separately applied wire grab irons, factory-applied sunshades, a frame-mounted bell, and DCC-ready Quick Plug technology with a 21-pin NEM connector. The prototype itself came in enough body-detail combinations to keep careful modelers busy, from Hi-Adhesion trucks on early units to steerable-truck options later on, along with high or low numberboards and different grill arrangements. That mix is what makes the AC4400CW such a useful model railroad engine: it can represent a specific railroad, a specific era, and a specific fleet position without looking like a stand-in.

The Ferromex option fills an especially useful gap for present-day layouts. Athearn said Ferromex introduced the current paint scheme in 2022 and that it now appears across several locomotive classes, including its AC4400CW fleet under Grupo México Transportes. That gives modelers a credible way to build a modern Mexico-to-United States freight consist without having to force older paint into a 2020s scene.

UP No. 6344 fills a different niche altogether. Athearn identified it as former Southern Pacific No. 298, fire-damaged in late 2006 and sent to GE for repairs, which makes the gray version more than a simple color variation. It is the kind of road-specific, history-heavy locomotive that gives a late-era UP lashup character, and that is the real strength of this release: Athearn did not just add another AC4400CW. It gave modern layouts two concrete reasons to look more like the prototype.