Second-generation diesel modelers looking for a heavy-duty six-axle road engine would do well to take a look at Athearn’s new Electro-Motive Division SD40. The model has prototype-specific details, wire grab irons, see-through fan grills, and other features usually found on higher-end models. This version is detailed specifically for the Southern Pacific; we reviewed a version detailed for the Chicago, Burlington & Quincy in the March 2016 Model Railroader.
The Ready-To-Roll SD40 includes an RTR Sound Digital Command Control decoder made for Athearn by SoundTraxx. While it shares some features with that manufacturer’s other decoders, it’s not a Tsunami or Econami.