During which season are subway cars required to be heated to specific temperatures for passenger comfort?

Subway cars are required to be heated to specific temperatures during the winter season to ensure passenger comfort. This requirement is essential because temperatures can drop significantly, and providing a warm environment in transit is part of the operator's responsibility to maintain a safe and pleasant experience for passengers. Heating systems in subway cars are designed to counteract the cold conditions outside, ensuring that passengers are not subjected to uncomfortable or potentially hazardous cold exposure while traveling.

In contrast, during the warmer months, such as summer, the focus shifts to cooling systems rather than heating, as passengers would likely require a comfortable, cool atmosphere due to high external temperatures. Seasons like spring and fall also do not necessitate mandatory heating in the same way winter does, as typical temperatures can vary significantly and often remain within a comfortable range for passengers.