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This process includes three main actions: normal maintenance which is the renovation of the track which means the systematic substitution of the track's elements that are subject to wear or ageing, or due to improvements in the track's performance, proceeded with a complete or partial renovation that only effects the rails, splice bars or ballast all being large improvement operations. One of the most important maintenance operations is correcting the level, which in the majority of cases is carried out by mechanical tamping using tamping machines that raise the track and tamp until it has reached its ultimate position.
