One of my favourite features of Citymapper when I lived in London was how they would let you filter routes by trains that had air conditioning for the complete

One of my favourite features of Citymapper when I lived in London was how they would let you filter routes by trains that had air conditioning for the complete hideousness that was summer 2019. Another interesting one I noticed was that they would increase the size of the "navigate home" button after a certain time of day.