There have been many theories about what to do to cure underground railways of overheating, but I have seen no evidence of monitoring to demonstrate the origin

There have been many theories about what to do to cure underground railways of overheating, but I have seen no evidence of monitoring to demonstrate the origin of the heats and how it progresses. One thing is certain - the problem is worse in the summer so reducing operational heat which is year-round will not hack it. Besides Glasgow, Warsaw and Prague do not overheat and they, obviously produce operational heat! So, I believe I have found the only answer that fits the evidence! Please see https://www.railbusinessdaily.com/a-reflective-perspective-the-whys-and-wherefores-of-metro-overheating/ https://www.railbusinessdaily.com/a-reflective-perspective-t...