2. Constitution of the track
An essential component of the infrastructure, the track comprises four fundamental elements:
the roadbed, the interface between the track itself and the ground;
rails and sleepers ;
ballast.
2.1 Platform
The subgrade is the developed land on which the track rests, meeting two main criteria :
the geotechnical nature of the soil: granularity, hardness,...
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Constitution of the track
Track layout
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