I've been taking the train to work regularly, and I can't believe I didn't start doing it earlier. With our recent home purchase and move, my 45 minute drive to work became more like an hour, so I knew I needed an alternative. The great thing is I leave for the train about the same time I'd need to leave in my car, and I only get home about 30 minutes later.
I jump on my bike in the morning at about 6:15 AM and ride 2 miles to the train station. It's downhill and so I can cover it super fast. Train rolls out at 6:29. Then it gets to my stop around 7:14 AM (It covers about 40 miles and there are only 4 stops on the way.) I then jump on my bike and ride about 9 miles to work. It's a bit slow going with the traffic lights, but I still get it done in about 35-40 minutes and make it before my 8 AM first period of the day.
In the afternoon I have a fair amount of extra time to get to the train before it heads home, so it's not nearly as rushed. The train itself is pretty nice and even has a bathroom. It's never crowded where I get on (apparently it gets busier as they get closer to San Francisco. I'm surprised more people don't do this, as the car traffic is terrible where I live. That being said, there have been some delays and stopped trains. It sounds like everything runs smoothly 90% of the time, which is good, but not great. I can see why being late once every two weeks could be an issues for people. That being said, yay for trains and bikes and boo to cars.