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Containers, chassis, and per diem
Intermodal is a box on a chassis, plus terminal rules that vary.
Common containers are 20 feet, 40 feet, 40-foot high cube, and 45 feet. They move on a chassis. The driver has to be allowed into that terminal.
Chassis splits, storage, and per diem are charge categories. The amounts vary by terminal. This page does not print a rate and does not name a railroad.
The course that goes further is Dispatch foundation. Reading this note does not enroll you.