Some bits about the service can be pretty astounding.

I used to live near the Central line. The station near home was open air and the exit was at the very end of the platform, so I always wanted to make sure I entered the train from the correct end. Service on the Central line is frequent enough (24 trains per hour off-peak), that, if I hopped off the train from the wrong end, the time it took me to walk the length of the platform was long enough for the next train to arrive.