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Reference.org
Train communication network
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<p>The train communication network (TCN) is a hierarchical combination of two <a href="/facts/Fieldbus/kna8UpU3">fieldbus</a> networks for data transmission within trains. It consists of the Multifunction Vehicle Bus (MVB) inside each vehicle and of the Wire Train Bus (WTB) to connect the different vehicles. The TCN components have been standardized in IEC 61375. </p>