Train-to-train communication will be the key technology for future railway operation. An increase of safety and effciency can be achieved by exchanging data between trains via ad hoc networks. For this purpose intelligent transport systems (ITS-G5) was developed for road traffc. The usage of this technology for railways is hardly investigated. We investigate the performance of an ITS-G5 data link for train-to-train communication at high speed conditions. ITS-G5 units were installed on two high speed trains and train-to-train (T2T) measurements were performed between Naples and Rome during four nights to cover different maneuvers. We present the analysis of the measurements data and resulting path loss models for tunnel and open feld environments.
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