[avuserow]

Faster acceleration. Each stop will cost less time, and Caltrain has a surprising amount of stops between SF-SJ (22 weekday) for its length (47 miles). You can see this effect already with the amount of express schedules that Caltrain has and their varying trip times.

[nulltype]

Yeah I couldn't find any estimates about how much time though. It seems like the express train would not be affected much at all.