The TVS would be about 0.50 for each loco, and it could be run anywhere.
Interesting. The Williams/WBB F3 uses, as I understand it, the postwar Lionel mold, and is listed as being suited for 27" diameter curves.
I’m currently looking at a Williams Hudson 4-6-4 steamer, listed as O27 scale. Will this run on both the O27 curves and the Lionel O27 (remote 5121/5122) switches? Anyone know if the loco and tender will both clear the switches? Like others on this thread my layout is all O27, and I’m running conventional. Note I do have a Williams GP9 and it clears the switches fine. Looking for a good pulling steamer that will work on my layout.