Air Brake equipment has to be cleaned and tested periodically, and new wheels are also applied several times within the service life of a freight car, usually because of being slid and incurring flat spots of condemnable size. But a major shopping would not be done unless the car was being modified. Most freight cars are simply repaired as needed, repainted about every ten years, and used and abused as much as possible. Tank cars are exceptions to this, and normally are shopped at intervals depending on what kind of tank car.
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