03-06-2023

More adventures installing DCC decoders.

While awaiting delivery of some decoders I decided to venture under the hood of a 20+ year old Athearn DD-40 with dual motors.

Although Athearn labels this model a DD-40 it looks more like a DD-35.  Same 4 axle trucks and close to the same profile.  After viewing quite a few pics of the actual DD-35 there are a few differences from this model.  One of the pics below is Athearn's explanation and reason for calling this model a DD-40.

One of the differences I found between the prototype DD-35 and this Athearn model is the number of radiator fans.  Six for this model and four for the DD-35.  Dual front light above the cab of the DD-35 and this model has that dual light plus another dual light in the lower front nose. 

Each motor powers one of the 4 axle trucks.  There is no connection between the drive shafts of the two motors so each motor runs independently.  I have two decoders to install in this loco and setting up the speed tables should be fun.  There is room under the body shell for both decoders.

I may get adventurous and make changes to the lights since there is only one incandescent bulb for the upper front dual light. Install a LED for upper and another for the lower front lights, add a rear light and a strobing beacon over the cab.

Reason why Athearn calls this model a DD-40.  This is on the exploded parts diagram that came with the model.