It is assigned by the manufacturer. You can find the GVWR on the VIN plate on the door or door frame of most power vehicles, and on the VIN plate on most trailers. If you add the GVWR from the Truck and trailer and it is more than 10,000 pounds, it's a commercial vehicle. For example, a Ford F150 has a GVWR around 7000 pounds by itself. A tandem axle flat bed trailer usually has a GVWR of 7000 pounds.
NJ Transit trains travel at different speeds depending on the line, express or non-express, and weather conditions. ! The NJ Transit train travels over 90 miles an hour. Just like the speed of lightening !
Express trains in the north could run at speeds up to 60 mph if the track was well maintained and the line was well funded by its owners, however these were usually short runs by today s standards, NYC to Boston, NYC to Philly, NYC to DC. get farther west or south and the standards got worse, speeds got slower.