We had the pleasure of riding the BART into San Francisco. As like the Caltrain we had trouble purchasing tickets. We wanted return tickets and ended up with singles. Maybe it was our lack of planning ahead. The train system was easy to use. The train was nice and comfortable and very clean The only problem we Had on the train was trying to see which station we were arriving at. It would have been nice to have a route printed somewhere in the train.The windows are very dark to see through. It is very much like the underground tube in London. A great experience.