Three Rail Maximum Traction Trucks?

The weight distribution in a 3-rail truck would no doubt be different than the prototype. Or rather, a 3-rail manufacturer would have little incentive to replicate that weight distribution on their interpretation.

On the full-size ones, "maxi-traxie's" were ok as long as you ran girder rail and single-point turnouts. On T-rail, especially with spring switches (like on, say, then Shore Line Trolley Museum) it was found that the pony wheels had a distressing habit of climbing the railheads at inopportune times At least that was the experience with BERA's Brooklyn 1792:

(photo: hiveminer.com)

I understand that since then, some truck work managed to loosen up the sideframes enough that this car now safely traverses the mainline, including its spring switches, though I don't know if the car is cleared to operate in anything other than closely-supervised operations.

---PCJ (ripping thru NJ at 120mph)