a rail or other structure laid parallel with the running rails of a track to prevent wheels from being derailed; or to hold wheels in correct alignment to prevent their flanges from striking the points of turnout or crossing frogs or the points of switches
rail servant à empêcher un déraillement au voisinage du cœur de croisement
Railway infrastructure consists of the following items, provided they form part of the permanent way, including sidings, but excluding lines situated within railway repair workshops, depots or locomotive sheds, and private branch lines or sidings: ... - Superstructure, in particular: rails, grooved rails and check rails; ...
