Marty Cooper wrote: "i know when the car was built with k brakes. with increasing demand for accuracy a reweigh date in the 40s would be preferrable. my error was that i should have said new date 1930. there is an accompanying prototype photo of the car with the new 1930 date and k brakes where the model has ab brakes."
You fell into the "tank car reweigh date" trap. Tank cars are billed by volume, not weight, so it's not required to reweight them periodically. It's common for a tank car to retain their NEW date for years after they were built, so this model with a NEW 1930 date and AB brakes is completely plausible.
