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PBM70s weren't around as long as most of the other sub-classes. There is some question as to whether or not they remained in service long enough to get upgraded. They definitely ran on the trucks that came with the Lima model, as opposed to the Kato trucks.The Lima model also is about three feet too long. The company rearranged features so that only new side slides for the tooling were needed to go with the standard floor and ends of the body tooling.
Thanks Bryan! II kept all those Lima trucks so swapping them out won't be such a big deal. I too, discovered the car was too long last night when I was measuring for truck placement. It's amazing that you know all these details, especially about the tooling!I certainly don't want to make a foobie out of this, but I'm trying to think about this logically to fill in the missing gaps of knowledge.
Those Lima trucks are based on an older early-20th-century prototype. They also were used on some of the heavy-duty flats of the time period. That we haven't seen any photos of the PBM70 riding on trucks of a newer design, such as the prototype the Kato trucks are based on, is another indicator that the class might not have survived into the "modern" heavyweight era. Dave Vollmer has suggested the PM70 is a better prototype to model for mid-20th century varnish. I haven't explored what is required to convert the Lima car into a PM70, but that might be an option worth considering.