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".