I was pointed to a HO product that does convert into a pretty convincing American OO Fox truck.

Fox trucks were a patented product of the Pressed Steel Car Co. which I understand made all of these trucks around of the turn of the 20th century. Mostly seen used on freight cars, one of the more exotic designs of Fox truck were their Express Passenger Trucks.

I believe they are out of production now, but these were manufactured in HO cast resin by Funaro & Camerlengo. Where these are useful for us is the wheelbase works out as correct for OO freight trucks. The design itself is a bit off but still it is pretty convincing.

I was able to obtain 5 sets of castings, and the question on looking at them was what car could I use these on? The set of 5 wood hopper cars seemed a good choice, and the first pair made are seen on this example. Still pondering the results. Basically you split the bolster and sand it down to fit inside plastic rectangular tube stock. I used HO 36″ wheelsets on the cars, which roll nicely.

I know few if any readers will search out this product specifically, but it does remind that there are unusual HO items out there, available today, that are useful in American OO.