Abstract
This testing process in ETCS laboratories has been useful not only before the putting the ETCS in service but also for the reconfiguration of the actual ETCS lines as it would be hard to do so many test scenario during a commercial service. These activities have been replicated several times, for example, to reach the actual ETCS version compliant to the UNISIG 2.3.0d.The success of the formal language analysis of Test-Specifications has also encouraged the RFI ETCS group to develop a state-charts model of the functional specification. This work is actually in progress but a first result, on the logical behavior of the system at the transition with a historical signalling system, has been done and validated.
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