Bogie exchange is a system for operating railway wagons on two or more gauges to overcome difference in the track gauge. To perform a bogie exchange, a car is converted from one gauge to another by removing the chassis containing the wheels and axles of the car, and installing a new chassis with differently spaced wheels. It is generally limited to wagons and carriages, though diesel engines can be exchanged if more time is available.
Read more about Bogie Exchange: Wagons and Carriages, Transfer Time, Variable Gauge Axles
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