The BART-BART transfer showed excellent eye for detail. You did leave out how Caltrain has a very non-zero probability of hitting a suicide, or a car left on the tracks, often right outside my apartment - drop in to say hi! - or just breaking down for no reason at all, delaying you for a further hour or two. But hey, no rush.
And although it may not apply to the OP, since we know how YCombinator feels about non-native English speakers, but imagine following all the steps above if English is not your first language.