National Train Control System: Class B systems for the trans-European rail system network are a limited set of train protection legacy systems that were in use in the trans- European rail network before 20 Aprii 2001 Class B systems for other parts of the network of the rail system in the European Union are a limited set of train protection legacy systems that were in use in that networks before 1 July 2015, The list of Class B systems is established in the European Railway Agency technical documents ‘Lisi of CCS Class B systems, ERNfD/2011-11, version 3,0’.
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