Train wheel sets is a single unit mounted on the wheel bogie with a hydraulic press machine with forced mutatis then fitted with roller bearings. The installation process is the condition of the wheel bogie on axle hole made with diameters smaller than the diameter bogie so that once entered forcibly, then the bogie will be locked in a hole with a strong axle.
Types of wheels by way of manufacture is
1. Steel cast / steel casting (casting steals)
2. Steel forgings roll (forging)
The composition of steel on wheels made softer than the steel rails because at the time the events of friction between the wheels of the rail (friction) will cause the surface eroded and worn, so in such a way designed erosion are charged to the wheel, this is done because of the replacement wheel is easier to do rather than replacement of rail and of course the cost of the replacement wheel has been worn less than the replacement of one bar rail.
based constructed :
1. Wheel with bandase (tire wheel)
2. Solid wheel
construction wheel surface that is in direct contact with the rails are not flat but the inside has a diameter greater than the exterior (flend), this is done so that the position of the wheels can lock their position on the rails so that the wheels do not slip when used with a maximum wear of the flange (e ) is 8 mm, with a slope angle (ɤ) surface of the wheel is 1:44 degrees, if the horizontal straight line will form an angle Sin 1.44 = 0.025 = 1:40.
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