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For clarification, are you talking about the kingpins on the trailers or the 5th wheel plates on the tractor?I believe you are talking about the latter?
I believe he’s referring to truck pins, fastening the trucks to the bolsters of freight cars.
If Americans called "trucks" "bogies", that would make things much clearer. Trucks should really be rubber-wheeled vehicles which travel over any solid surface. Bolster pins is also a good descriptive term. Aren't those called "kingpins" in 1:1 railroad lingo?
Methinks the term "truck" was used for railroad trucks long before it was used for the rubber-tired vehicles.Doug
It was "kingpin" that threw me off, not "truck". I've only ever heard kingpin used in reference to the hitch lug on highway trailers (movie and criminal commanders notwithstanding ).