On the 4 x 8 layout the outside curve is 042. You can put a small spacer of 4" or so to stretch it out a tad. MTH claims the largest locomotive ever made, the 400e will run on 042. It's usually 6-wheel passenger car and loco trucks that cause the problems. On my layout I was running a 390e steam locomotive with both 300 series passenger cars, and 500 series freight cars. I ran the MTH New York Central 260 steam with freight cars. And I usually ran a 252 tinplate passenger set on the elevated loop. Now I just set the whole thing up on the floor as a temporary layout. The wiring needs to be real simple and accessory wiring is really not possible. So it works...quick, easy, and fun. That's what trains are for, and this did not cost a fortune at all.
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