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Radio electronic token block

railway signalling system

Pronunciation
/ˈreɪdioʊ əˌlɛkˈtrɑnɪk ˈtoʊkən blɑk/
/ˈreɪdɪəʊ ɪlɛkˈtrɒnɪk ˈtəʊkən blɒk/