My guess is that it sarcasm, and nothing to do with "Q" per se. Possible translation:
O(ver) H(eard) on the Q(uestion) train intercom: "Attention passengers (WH press pool) , the intercom phone (microphone) is for emergencies only, it is not for asking the conductor questions."
WH Press is not allowed to ask questions based on the new rules (Acosta rule).