Request for information: 

"will look forward to the written official response on the heating system- how it physically works i.e. does the function of the diesel unit allow for heating/cooling as per a petrol engine in a car, or is there some cost involved to operators other than the electronic maintenance or cooling fluids. Either way, what are the policies or arrangements or settings for cooling and heating of passenger carriages, who applies and oversees the policies, who manages the cooling and heating during each journey, how are the passenger fluctuations, e.g. the early morning passenger needs, accommodated?"