Interesting. My layout consists of all #6s for simplicity. The track plan isn't. The only problems I have are with old Flyer items and some new Flyonel things. It seems to boil down to gauging of the wheels. Some of them hit a closure rail when going towards them. If the offending item hits the closure rails, I regauge it. However, some Flyonel items don't take kindly to regauging, like some things with the "split" axle. I then install a small piece of rail shaped to guide the flange towards the stock rail, similar to standard guard rails at the frog. I then paint it black and it virtually disappears. They all then function flawlessly. I run classic Flyer, hirail and even a scratch built gas-electric with Black Beetle trucks.
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