Bletchleyite
Veteran Member
The worst is malfunctioning (or wrongly adjusted) air conditioning, which renders the inside of the train like a fridge, while people are dressed for the warm summer's day that they left home in. I never travel without a pack-away quilted coat these days, having been caught out in a chiller compartment once too often. ATW used to be awful for this, although things seem to have improved more recently.
Do you not find it pleasant stepping into a fridge on a hot day? I do.