Need to know which stations don’t have exit barriers or escalators? This webpage about the London Underground will help.
Back in the day, there was a train journey that had no barriers at either station. My home station eventually changed that but I always wondered what journeys you could make with the potential to just walk right on through without a ticket (I do not endorse this btw).
Geoff Marshall is a TfL enthusiast and created a page on his website dedicated to London Underground facts and figures. It’s particularly helpful for disabled people as not all stations have escalators or lifts. Also interesting to see how many stations are so close together in terms of journey time. Leicester Square to Covent Garden, for example, takes less than 40 seconds on average.