I am nowhere near the point of wiring my layout (haven't even put down the first section of track, had no time) but I am mulling over something. I have #6 ross ready switches with dz1000 switch machines (2 pairs, to be used on 2 separate crossovers), and a #11 switch as well. In the Ross documentation they mention that some engines, with close or only 1 roller, can have problems on it. Most of my engines probably would be fine (mix of post war and modern conventional engines), I could see maybe a couple of RMT engines I have having problems. The recommended fix is to use a relay to power the frog, my question is have people found it worth the effort? Does it make regular engines go through easier? I am not worried about the cost (I don't have that many switches that would likely need a relay, maybe 5 of them), for me it is wiring them in when wiring isn't my favorite thing. If it will improve overall importance I will do it, if it is for a couple of balky engines I likely won't run much I may just leave them as mostly shelf queens.