for abnormal conditions, loose bolts, and damage to trackside infrastructure such as fencing. The frequency of patrols varies depending on factors such as track speed, the specific construction of the track and yearly tonnage on a route. When hot weather is forecasted, additional "hot weather patrols" are also implemented; specifically looking for bents or kinks, caused by the rails expanding in the heat.

Repair and replacement

The most fundamental maintenance of way task is the construction,

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