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the indusi system was deployed in germany since 1934 and the system spread to austria and countries of the historic austro-hungarian empire which share a common root with germany in terms of rail transport history during the german customs union.
indusi ("induktive zugsicherung") of pzb ("punktförmige zugbeeinflussung") is een treinbeïnvloeding systeem dat vanaf 1931 in onder andere duitsland, in oostenrijk en in zwitserland onder de naam integra-signum wordt toegepast.