Thanks guys. 
I may look around for more cars now that it's a real locomotive and might actually be able to pull them.
Actually Alan, you can do this upgrade for minimal expense. If you keep the RS 2.5 board and the LCRU2 and just rearrange them, it would have been cheaper. I had all the stuff to upgrade to ERR, and lots of RS4 boards, so I decided to upgrade. The only added complexity with the older electronics is you'll have to figure out a truck mounted switch for the motor RPM trigger, with the R2LC & RS4 boards, that was taken care of painlessly for me.
I'm trying to come up with some neat lighting for the sidelites near the rear of the locomotive that are triggered by the horn, still thinking on what that would look like. Any ideas on what would look cool there are gratefully received. The little windows are 1/8" tall by about 7/16 long, so probably only two or possibly three LED's would fit. I'm thinking of something like slowly varying intensity in a couple of colors when the horn blows.
