UIC 719:2008-02

This leaflet relates to earthworks and track beds for ballasted track. The study of railway track substructure can be considered as two separate subjects: the design of track bed layers and earthworks for new lines, maintenance of the track bed layers and earthworks on existing lines, which show signs of ageing or are exposed to a more severe loading regime (increase in gross tonnage, axle-load or speed). The technical design life considered in this leaflet for substructure is of 100 years. The leaflet is divided into 3 sections: terminology and classification of soils and subgrades, construction of earthworks and track bed layers for new lines, maintenance of earthworks and track bed layers on existing lines.