On the 20th, the maximum temperature in Tokyo did not reach 9 degrees, the coldest day on record for this time of year in 40 years. Across the country, 315 "winter days" were observed. ■Is it too hot on trains in winter? 26 degrees on a commuter train! What can you do? Caster Inoue Takahiro: When it gets cold, posts like these increase on social media. "The heating is so strong that I have to take my jacket off because it's too hot..." "Packed trains at this time of year are so hot I feel like it's summer!!!!!" Railway companies turn on the heating because they want their customers to have a comfortable ride, but if it's too strong or there are a lot of people, it inevitably gets hot. N-Sta staff measured the temperature on their commutes to experience what it's like. ▼Shiki Station to Wakoshi Station (about 7 minutes on the Tobu Tojo Line) 20 degrees It's a little hot, but it's only 3 stations, so it's bearable▼Wakoshi Station to Meiji-Jingumae Station (about 36 minutes on the Tokyo Metro Fukutoshin Line) 26 degrees It's the first train, so I can sit, but I open the front of my jacket to try to get some cool air in▼Meiji-Jingumae Station to Akasaka Station (about 6 minutes on the Tokyo Metro Chiyoda Line) I was seriously damaged in the section before 24 degrees, but I want to cool down, so I feel the coldness of the glass near the door that doesn't open■The unknown efforts of the crew Inoue Caster: How do people at railway companies adjust the temperature? At Tokyo Metro, the crew turns the heating on and off. Meanwhile, the heating is set to 24 degrees, and is supposed to be adjusted by a sensor. However, according to a Tokyo Metro public relations officer, "We also receive comments that it's 'too hot' or 'too cold,' so the crew makes fine adjustments to the heating." Although a sensor is used, it seems that the temperature goes up and down slightly based on human intuition, knowledge, and experience. In addition, they visually check the congestion situation. They make adjustments such as lowering the temperature depending on the level of congestion. They visually check the clothes of passengers, checking the rate at which they are wearing coats and how many layers they are wearing, and adjust the temperature. Lawyer Maiko Hagiya: When I jump on the train with my hands full with heavy luggage such as a computer or court records, I'm already drenched in sweat, so I sometimes think, "I wish they would turn up the air conditioning a little more," but the station staff are making such an effort. Caster Chiaki Horan: It's not just the air conditioning. Especially during rush hour, they also have to check whether passengers have finished getting on and off. Safety checks are also difficult. Caster Inoue: There is no temperature that is comfortable for everyone. Veteran crew members can tell that "there are more people than usual today," predict congestion, and turn down the heating in advance. ■There was a train that didn't use heating The famous "too deep" train... Caster Inoue: The Toei Subway Oedo Line does not use heating even in winter. This is because the entire line is underground and does not come into contact with the outside air, and the diameter of the tunnel and the small size of the carriages trap heat. == ...