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.
UIC R 719-2008 history
2008UIC R 719-2008 Earthworks and track bed for railway lines