3. Infrastructure
Like all transport systems, railroads require ground infrastructure. It can be broken down into three main sub-assemblies:
platform and track ;
engineering structures ;
terminals and stations.
3.1 Platform and ballast
The platform represents the land area. In France, the platform occupied by railroads represented 97,000 ha in 2003. In most cases, the construction of a railway line requires specific works such as embankments, embankments and excavations, with the addition or extraction of materials. Special precautions are taken to ensure drainage and evacuation of rainwater. Ballast, made of hard, angular aggregate, is spread on the...
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