20-20736-1. I finally understand Proto 3-2. 3 rail to 2 rail compatible. I am showing my green side with a lot of this. I thought you meant sound 3 from sound 2 conversion and kept asking myself, what the heck does that have to do with operational ability. But it's an engine that can be easily operated on a 3 rail set up or a 2 rail set up. Know that I am aware of that, I am going to look up the DDA40X and see if that one has the same issue. The one I bought was a reboot of the 1998 model and it came out in, wait for it, music builds, smoke clears, an errant bird flies by...….2017. So this is probably not a pick up wheel issue but a design change that causes an issue probably not thought of in the R&D room. Depending on how much a set of 2016 trucks cost, I may just stick to 10 or better smph when operating this Engine. My fear is that even if the trucks are inexpensive as a set or one at a time, finding 2016 trucks designed paint wise for a Union Pacific locomotive may not be possible. My BNSF has the silver covers over them that fit the real world look. The UP under carriage is brown. I will ask MTH, if I can get them to talk to me, and see what they have on site.
Thank you so much for this information, now I have one more tidbit of knowledge that will help me in the future when purchasing train items. Until right now I had no idea what that P3-2 meant.