@Trinity River Bottoms Boomer posted:The American Flyer model of the Alco PA/PB used a correct prototypical six wheel truck, albeit the "center wheel" was blind, e.i. no wheel. Lionel could have produced a flexicoil six wheel truck adapting the same concept for "SD" diesel models as well.
That's exactly what Lionel did for the so-called Flyer SD9. 6-wheel siderframes over the PA truck.
Lionel also has a proper 6-wheel truck for the Flyer U33C's, SD70's and ES44's since 2012.
Rusty