A beam spanning the track which is used to support the rails. Originally wooden but concrete sleepers are generally used now. Steel sleepers have also been used occasionally.
Hard core used to provide a stable base and good drainage for the track. Typically granite Chipping's between 1-2 inches diameter are used, although other materials are not uncommon.
The raised edge of the ballast.
noun: impairment resulting from long use (Example: "The tires showed uneven wear")
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