Why are the heating limits for subway cars during winter set between 40 and 64 degrees?

The heating limits for subway cars during winter are indeed set between 40 and 64 degrees primarily to keep passengers comfortable, especially considering that they are likely to be wearing winter clothing. This temperature range is typically sufficient for individuals dressed appropriately for colder weather, allowing for a comfortable environment without overheating.

While there are considerations related to energy conservation, mechanical stability, and safety regulations, the primary focus of the heating limits is on passenger comfort. When passengers enter a subway car during winter, they should feel a welcoming warmth that contrasts with the cold outdoor temperatures while not exceeding levels that could lead to discomfort due to excessive heat, especially when dressed for the weather.