tube sightings

A young man sat down next to me on the tube and said to his friends, "Remember, the Circle is the oldest of all the lines." I asked him about this, was it especially important or memorable, and he told me they were attempting to stop at all 27 stops and have a drink at each one. They were already well along, and I said it was a good thing that some of the stations were closed. I suggested that he could spread this out over more than one night, that the concept still applied, but this was obviously an old person's perspective.