Reply to "Questions about wheelsets for 3 -> 2 rail conversion"

Buy the NWSL sets assembled.  I believe you need to press them together otherwise and keeping the insulator straight in the wheel can be a pain. 8293-4 is the 36” Lionel spinner with a .145 tread. You can use these axle specs and figure out which is the 70T (33”) wheel if you need it. A lot for Lionel cars can be direct swapped to atlas trucks which makes the car ride lower. The difference between atlas 70 and 100T trucks is the wheel diameter. The new design of atlas 2 rail trucks has a slimmer side frame that makes it look more scale. The slim side frames are only on the 2 rail trucks.