Links between centers served by railroads require the creation of routes: this is the function performed by turnouts. Turnouts are divided into two categories (figure 18):
a turnout is used to create a deviated lane from a direct lane, or to ensure communication between two lanes;
the crossing is the at-grade intersection of two tracks. It can be combined with one or more turnouts: this is the single or double crossing-junction.
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You can easily identify them thanks to this pictogram:
Special lanes
