http://www.chaski.org/homemachinist/vie ... 7&start=36
About halfway down the page, you can see the pictures of his truck setup with the bearings on angle brackets near the groups of 4 silver bolts, and the self aligning pillow block he used for his pivot point for his truck. A few pictures down, you can see the steel pad on the underside of the locomotive frame that the bearings ride on.
"The two small ball bearings—lateral roll bearings—on the truck bolster make contact with wear pads on the underside of the frame. The center bearing is shimmed relative to the bolster so that a very small amount of contact between the lateral roll bearings and the frame is maintained at all times. Hence the truck is free to swivel and longitudinally roll relative to the frame, but cannot laterally roll. Any lateral roll that occurs with the unit is due to movement of the wheelsets in the truck frame pedestals, which is resisted by the springs. The result is that the truck can easily follow abrupt changes in track height, such as might be encountered when moving the unit from a transfer table to a lead track, yet maintain good lateral stability."
All credits and genius status for this design go to bigdumbdinosaur
