Charlie's Tip: This is the single A-unit, some pictures show the complete set of three units, which include 20578, 20588 and 20579

This is a model of an EMD F7 A unit diesel locomotive painted and lettered for the Denver & Rio Grande Western Railroad. The paint and lettering are prototypical for Era III. This locomotive has a different road number from that of 20578. It has traction tires and both trucks are driven by powerful ball bearing Bühler motors. The built-in mfx/DCC decoder can be used for controlling a variety of light and sound functions digitally. A socket built into the rear of this A unit locomotive supplies power from the decoder to the speaker in the B unit locomotive that was made to accompany this engine. The locomotive has many separately applied details, including cab doors that can be opened.

Length over the coupler 61 cm / 24".
 
Highlights:

• Many light functions such as a headlight or a Mars light.

 
The B unit to go with this locomotive is available at ajckids.com under item number 20588, and another A unit with a different road number is available under item number 20578. A typical Era III passenger train can be made with the new D&RGW cars that are also available.
 
The basic running sounds will also work in analog operation.