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high speed rail europe bombardier transportation invensys rail siemens mobility ansaldo sts ertms thales azd praha mermec caf alstom transport unife 2012 ertms level 1 ertms level 2 signaling rail signalling rail network turkey rail network worldwide deployment in switzerland swedish rail network deployment in spain infrastructure manager adif deployment in italy ertms level 3 ertms baselines memorandum of understanding trains rail freight traffic management; control centre operators freight corridors ertms deployment in the uk network rail belgium deployment netherlands freight infrastructure signaling system etcs technical specifications eu commission europe