Change of gauge is the process of converting a railway from one rail gauge to another.
Change of gauge or gauge change may also refer to: Change of gauge (aviation), change of aircraft without changing the flight number Break-of-gauge a location where two railroad lines of different gauge meet Bogie exchange, a system for operating railway wagons on two or more gauges by switching bogies Variable gauge, a system using adjustable wheel sets where the gauge is altered by driving the train through a gauge changer Dual gauge, the use of additional rails are laid to accommodate two different gauges on the same track Track gauge conversion, replacing a railway track of one track gauge with a railway track of another track gauge
See also Gauge fixing, a mathematical procedure for coping with redundant degrees of freedom in field variables