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BCU CONTROL UNIT T4-T5 - failure mode “ failure of power supply”
Among these failures only the failure #2 is categorised as leading to “train mission not started/completed”. As explained in the remark column of the XX, this categorisation is due to contractual requirements of failure categorisation. From the technical point of view the train can be moved using the back-up brake as reported in “Compensating Prevision“ column and no limitation of speed less to 60 Km/h is necessary.
I strongly suspect that the 'CU' part already stands for 'control unit' — but what the 'B' might stand for is wide open to speculation, especially as you've given us hardly any context to go on: "railways"?
However, I suspect binary counter unit is pretty unlikely, unless there is something you already know about it that you're not telling us; it seems way too low down in the hardware architecture for what seems to be being discussed here (i.e. a pretty high level)
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26 mins confidence: peer agreement (net): +1
unité de commande de freinage
Explanation: Although the reference below appears to relate to aviation, I feel pretty sure that the translation of the abbreviaiton would eb the same.
Le Bureau de la sécurité des transports du Canada - RAPPORTS ...
unité de commande de freinage (BCU),; transducteurs de pédales de frein,; répartiteurs de freinage intérieur et extérieur,; vanne d'arrêt de freinage, ...