So, sometimes things go differently than what you expect.
At MacArthur BART (and most BART stations), it is stated on signs and therefore, predictable what train is on which track. This morning I came up the stairs and there were two trains waiting at the platform. On any normal day, from the stairs, Concord/Pittsburg/Bay Point trains are to the right, and Richmond trains are to the left. The doors to the trains were open, so I rushed into the nearest car, and waited for the doors to close.
As the train took off, I started reading, but I noted that we got to a tunnel before stopping. I thought I must have not been paying attention, and missed Rockridge. Then the next station we stopped at was underground. Neither Rockridge, not Orinda are underground. Then right before the doors closed, I heard the voice of the operator say, "Richmond."
Damn, wrong train.
So, I got off at Berkeley, thankful that there was a new bike policy in place from July 1 allowing bikes in the commute direction, and rode back to MacArthur where I got on a Concord train, and ended up at work no earlier than I had been getting there.