@Rusty Traque posted:
60"??? That's 8 prototype inches, almost a full 1/16" larger that would be on an S Russian. It's easy to get away with slightly undersized drivers, but harder to get away with oversized ones.
Stretched out over 5 driver pairs that's an extra 5/16" on an S scale model, not counting some additional spacing needed between drivers. I'm not sure the selective expansion over the length wouldn't be noticeable. Might as well just drop the trailing truck, add another driver to the Mikado's frame and plop the Pacific/Mikado boiler back on it, then call it done.
Maybe Lionel should have used two Mikado drives under the Y3... After all, 63" drivers are close to 57" drivers...
I believe if you take the average of all the different drivers you mentioned it would actually be 59.5". I was just trying to round it off. Yes, if you put the smallest next to the largest I am sure you would see a difference. I find it quiet noticeable on the ACG Reading Atlantic...