Is this not rude
A woman sat in the seat behind me on my commuter train opened window. What about others in the carriage? What if we don’t want the window open? In other circumstances doing something similar would count as being rude. I am now colder than I want to be. Her choice has dictated what others feel like. There is little I can do. Shutting the window again would be as rude. So I live with it. What are other shipmates’ experiences?

Comments
That is the problem. There is no agreement either way. Neither side ask they both just assume it is ok. It is not too bad at the moment but in winter people open the windows and you can visibly see other shiver because it is so cold.
I tend to chat to tourists and other travellers when I can. Whether I am an oddball is for others to decide.
The apparent rudeness in the OP depends on the circumstances. I've often seen people ask their fellow passengers whether it's OK for them to open the window.
I'll get me coat ...
Yeah, and I've experienced the case where there were both openable windows and A/C - which tends to lead to a kind of tug of war effect in the heat
Unless I remember to be polite. Which I might not.
I find it surprising you can manage to be too cold on a train, in a heatwave, that is apparently too full for you to change seat and get out of the draft.
Why's that? We are talking about the top part not the entire glass panel.
Some more modern train carriages here don't have windows that open, as far as I am aware. It's not something that's ever bothered me one way or another and although I no longer commute by train I do use them fairly regularly.
I'm more bothered by over-crowded trains, delayed trains or blocked loos.
I'm old enough to remember the old fashioned carriages with compartments. They were more sociable and you could open the windows.
C S Lewis had a story of his father travelling in one in Northern Ireland. A fellow passenger, was unable to get to the toilet (for whatever reason, possibly lack of a corridor and an expectation that you 'went' into the carriage with the toilets when the train stopped at a station?). The fella dropped his trousers and did a dump on the carriage floor.
Lewis's father opened the windows and lit a pipe to disguise the smell whereupon the grumpy passenger pointed to the 'No Smoking' sign on the carriage window.
Lewis's father felt it was emblematic of double-standards in Ulster Protestant religiosity.
At least we don't have to put up with that sort of thing on Britain's modern and efficient rail network ....