Ontario suggests their rails are designed for 30C to -30C: https://www.cbc.ca/news/canada/hamilton/headlines/metrolinx-warns-heat-wave-could-impact-rails-with-s

Ontario suggests their rails are designed for 30C to -30C: https://www.cbc.ca/news/canada/hamilton/headlines/metrolinx-warns-heat-wave-could-impact-rails-with-sun-kinks-1.3665782 https://www.cbc.ca/news/canada/hamilton/headlines/metrolinx-... (2016)