So, Friday morning the Caltrain totally overshot the station and had to back up. Maybe a week ago I was on another train that did the same thing, but at Hillsdale. It has always seemed strange to me that the train does not stop in the exact same place every time.
I have never seen anyone fined for going through the barriers, but I have seen a few people do it. I have, however, seen folks get fined on the train for not having a ticket, although most of the time they are just made to get off.
Overall, I love Caltrain! But then, I love trains in general, so no surprise really. Also, the wikipedia entry is super interesting.