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She would never say "Please ensure you are travelling in the correct part of the train" unless there was a "Where the train will divide" e.g. "This is Haywards Heath - where the train will divide. Please ensure you are travelling in the correct part of the train. Coaches 1 to 4 will continue to Littlehampton. Coaches 5 to 12 will continue to Ore. This is coach number 12 of 12".