A scenario: passenger approaches member of train crew (who is picking up the unit for the first time) at terminus station and says it's very cold on the train please turn on the heating. Member of train crew agrees and turns heating on (time of day fits in with company instructions for when heating should be on). Passenger thanks member of train crew and train starts it's journey. A few stations down the line the member of train crew is contacted by the signaller and told somebody on Twitter has complained it is too hot on the train and has requested the heating is turned off. Member of train crew stuck in the middle between passenger who was too cold and passenger who tweeted they were too hot. When member of train crew assessed the heat level on the train they now found it to be quite comfortable. Should signallers, drivers and other members of staff really have to be contacted midway through a journey because one person on twitter has claimed it's too hot? Surely each persons idea of a comfortable temperature is different. This member of train crew was a little bit put out that an attempt to make one passenger happy resulted in another becoming unhappy. Just wondering if others have had similar experiences and what they think about the whole Twitter thing.