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[[Image:Rollingstock axle.jpg|thumb|250px|Train wheels are affixed to a straight axle, such that both wheels rotate in unison. This is called a wheelset.]] | [[Image:Rollingstock axle.jpg|thumb|250px|Train wheels are affixed to a straight axle, such that both wheels rotate in unison. This is called a wheelset.]] | ||
An axle is a central shaft for a rotating wheel or gear. In some cases the axle may be fixed in position with a bearing or bushing sitting inside the hole in the wheel or gear to allow the wheel or gear to rotate around the axle. In other cases the [[wheel]] or gear may be fixed to the axle, with bearings or bushings provided at the mounting points where the axle is supported. | An axle is a central shaft for a rotating wheel or gear. In some cases the axle may be fixed in position with a [[bearing]] or [[bushing]] sitting inside the hole in the wheel or gear to allow the wheel or gear to rotate around the axle. In other cases the [[wheel]] or gear may be fixed to the axle, with bearings or bushings provided at the mounting points where the axle is supported. | ||
[[Category:Definitions]] | [[Category:Definitions]] |
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