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Trackside data, referred to a main signal, which is transmitted at locations in rear of the main signal. Provides, for example, the ability to inform a train that the signal ahead has cleared.
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ERTMS/ETCS - Glossary of Terms and Abbreviations - version : 4.0.0 - date 05/07/2023

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Technical Document
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ERTMS
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ERTMS/ETCS - Glossary of Terms and Abbreviations - version : 4.0.0 - date 05/07/2023

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