Hi,i think i figured out the mystery of the tires. Simanco an older name used by Singer sewing machines. SInger MANufacturing COmpany=SIMANCO.
The tires used on the rail car are actually bobbing spool winder rings ! Thats why there is no tread & the sizes of the winder rings & the rail car tires match perfectly. Again another example of the ingenuity of our early electric race car pioneers.
Now we still need to figure out where the wheels came from. Thanks,Bernard