On the hottest days of this sweltering summer, riders on the Bloor-Danforth subway would brace themselves as their train pulled in, hoping that they would not get one of the cars without air conditioning.

If they came up unlucky, some would sprint to the next car, hoping to find a bit of cool relief there. Others would suffer in silence, sweating their way to work in subway cars that reached temperatures in the mid-30s.

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