The SD70ACe is the successor to the older SD70MAC. Built from 2004 to 2014 in the United States, the SD70ACe was originally designed to comply with EPA Tier 2 locomotive emissions regulations. Beginning in 2012, newly built SD70ACes were EPA Tier 3 compliant. SD70ACes are equipped with EMD's 16-710-G3C-T2 prime mover, rated at 4,300 horsepower (3,200 kW). Later Tier 3 models are rated at 4,500 horsepower (3,400 kW). They are rated at 157,000 lbf (700 kN) continuous tractive effort (191,000 lbf (850 kN) starting). Braking effort is rated at 106,000 lbf (470 kN).  Although mechanically similar to earlier SD70 units, the SD70ACe rides on a new underframe and uses mostly new sheet metal above the frame. Electrical cables and air lines have been routed beneath the walkways on opposite sides, allowing easier access for maintenance. Continuing the designs of the SD80 and SD90 series, the radiator on the locomotive is nearly as wide as the cab, the center hood section is a step down below the roofline, and the dynamic brakes have been moved to the rear of the hood. The SD70ACe uses the cab design of late-model SD90MAC-H units, which uses rectangular window glass and is externally different from the two cab variations used on earlier SD70M and SD70MAC units. In 2008, EMD standardized the isolated cab on subsequent SD70ACes after non-isolated cab units were restricted from leading on BNSF Railway due to excessive cab vibration.

In this run Broadway are offering models in 13 distinct paint schemes.   Each one has detail variations accurate for each paint scheme.   The variations include low & high headlight, isolated and non-isolated cab, long and short sunshades, two brake wheel variations, three cab roof variations, and two blower vent layouts.  The models are available with Paragon4 Sound/DC/DCC, or in their No-Sound / DCC-Ready variation. 

Paragon4 Sound & Control System Features:

• Operates in DC & DCC with improved DC speed control (use DCMaster for DC Sound)

• Built-In extra capacitance to navigate imperfect track

• Pro Lighting Mode offers individual control of all lights on model

• Switcher Mode for precise low speed control

• Record & Play Operation - Records and plays back sounds and movements once or repeatedly for automatic operation

• High Resolution Audio

• Quillable Horn for various whistle lengths and patterns

• Choice of 3 selectable Horns

• Alternate Whistle / Horn where applicable for locomotive with air horn and steam whistle - both the main whistle and alternate can be easily played

• Adjustable bell ringing interval for faster or slower bell

• Numerous user-mappable functions with available keys

• Multiple realistic passenger and crew sounds play on command

• Grade Crossing Automatic Signal

• Automatic Forward / Reverse Signal

• Prime Mover sound intensity varies with load

• Individually adjustable sound volumes for each effect

• EZ Reset Button for quick return to factory default settings