![]() Model railway elements such as track, rolling stock and locomotives are categorised by their wheel or track gauge. The wheel gauge of a rail vehicle must be compatible with the track gauge of the network it runs on. In the case of a rail wheelset the axle track is called wheel gauge and is measured from wheel flange reference line to wheel flange reference line on the wheels of a rail car or tram axle. If wheels of a different offset are fitted, the wheel track changes but the axle track does not. In vehicles with offset wheels, wheel track is distinct from axle track because the centreline of the wheel is not flush with the hub flange. For a vehicle with more than two axles, the axles are normally numbered for reference. For a vehicle with two axles, the measurements can be expressed as front track and rear track. Despite their distinct definitions, axle track, wheel track and track width are frequently used interchangeably, normally to refer to the distance between the centerline of the wheels.
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