I commute on the northern line 3 times a week ... it's not fun, but it's bearable ... just. The trick is, if the window at the end of the carriage isn't open,

I commute on the northern line 3 times a week ... it's not fun, but it's bearable ... just. The trick is, if the window at the end of the carriage isn't open, make a beeline and open it, as the air moving past does help keep you cooler.