I use to sit/stand on the old slam-door 300 emu's from Upminster to Fenchurch Street for the odd couple of years I spent commuting to London when I first started work and if there was train heating it often didnt work or was unbearably hot. But there is nothing colder/hotter than an underground train if you want extremes of temperature. I used to muse that one day all trains would be air conditioned as standard - other people used to look at me as if I was mad!! Dont times change.
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