ON28 - hope you don't mind if I leverage your existing "Atlas Master GP38" topic to show how I did mine. Since we both started with the same loco, I thought it would be easier for people to see how two people did a RailPro install on the same loco in the same thread/post as opposed to having to jump between two separate topics.

I leveraged ON28's great concept and fabricated a styrene platform with copper beading strips (got mine on Amazon) to minimize the wires.
On this install, I also utilized a Scale Sound Systems speaker - wow are those good!
ON28 also graciously clarified how he strucutured his styrene platform in a separate message to me.

Here's a photo of mine before the final tucking and (Kapton) taping of wires. I wanted to make it easier to see the styrene/copper beading strip platform.
 [ You are not allowed to view attachments ]

I also had the weights milled down to make room  inside the shell.

I have another one of these to do and think I will change it up by placing the SSS speaker over the forward flywheel instead which I think will leave more room for the RP module and make the wiring easier/simpler.

Thanks Bill - that was the ticket!
I view that as a short-coming. If I have a fleet of HC's then every time I add a new loco I have to upload the new file to each HC one at a time, acquire the loco with each and every HC, and then update the pic on each and every HC.
Oh well....

I've got questions.....
I used HC Simulator (HCS) in combination with RailPro Assistant (RPA) to upload a custom loco image I made for my new ATSF GP38 #3501.
Using the HCS, I was able to acquire the new LM-3S installed in the my ATSF GP38 and successfully change the image from the stock RE blue loco image to my custom ATSF #3501 image.
Then I closed the HC Simulator on my computer and turned on one of my HC-2B's. It found the new LM-3S GP38 but showed the stock RE blue loco image. So, I then selected "locomotive Setup" and tapped on the stock RE blue loco image. Then, I've had both of the following happen (because I tried multiple times):
A) It listed both "RE Loco" and "3501 ATSF GP38 c/f". I selected the ATSF GP38 and it said "please wait" and finished what it was doing, but the image/icon did not change/update.
or
B) After selecting "3501 ATSF GP38 c/f" from the list it comes back and says, "File not local!".

I thought that once the custom loco file was saved/uploaded to the LM-3S that whenever any HC-2B subsequently discovered it for the first time that all of the custom files (image, sound, lights, etc.) were transferred/displayed/shown on that HC-2B?

I even tried "Remove Product" from that HC-2B and then re-acquiring it. That made no difference.

What am I missing?

Somebody upgrading to the new HC-3's?  I love the feel of the new controller.  Night and day difference.

-Kevin

Look in the classified section for details.
Lee Nicholas