The different ERTMS/ETCS application levels (short: ETCS Levels or Levels) are a way to express the possible operating relationships between track and train. ETCS Level definitions are related to the trackside equipment used, to the way trackside information reaches the on-board units and to which functions are processed in the trackside and in the on-board equipment respectively.
ERTMS/ETCS can be configured to operate in one of the following application levels:
More information can be found in “Railway signalling since the birth to ERTMS” white paper available in the “White Papers” section.
“Railway signalling since the birth to ERTMS” available here:
“White Papers” section available here:
In the following video are described in a very intuitive way Levels 1, 2 and 3:
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