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radio electronic token block

railway signalling system

en-US/ˈɹeɪdiˌoʊ ɪˌlɛkˈtɹɑnɪk ˈtoʊkən ˈblɑk/
en-GB/ˈɹeɪdɪˌəʊ ˌɪlɛkˈtɹɒnɪk ˈtəʊkən ˈblɒk/

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signalling block system