Dublin/Pleasanton 7:28AM Train
Before the new West Dublin/Pleasanton station began construction, the 7:30AM train consisted of the two prior 5 car trains into the station joining their C cars on the platform to create the SF bound train. This generally was OK -- most of the time they were able to accomplish this by 7:30 -- sometimes they had enough time to flip the train around to the opposite platform, and sometimes they would depart from the same platform and cross over at the switch just pass the 680 overpass.
Since the construction began, they have not been able to coordinate getting those trains together on time for the 7:28AM departure. Passengers have to crowd on the platform and then it's a mad rush for a seat when the train is joined and the doors open.
As of late, they have either had an extra train on hand rolling out of Dublin so when I arrive at 7:20, there is usually a train on the platform with the doors closest to the escalator open to allow us to board. Sometimes this doesn't happen, and we have to wait for the trains to join; we generally depart in those instances around 7:31-32 or so. We do tend to make up the time, though and arrive at Embarcadero at 8:15 on schedule. It seems to have been a crapshoot as to whether we'd have a train available or not. Perhaps its just logistics being worked out, but I'm wondering if they are making this more of a permanent system change that the train should be available to leave promptly at 7:28.
Not that I really mind all that much about standing outside on the platform to wait for a train, but it's certainly nicer to already be in the train and in a seat booting up my laptop than wondering when the train will arrive and who's going to try and push me over to get the "better" seat.

It varies daily depends on
It varies daily depends on who's making the decisions. I will say that whoever is letting things get down to the last minute like that is really gambling with time.
You may know this, but they can't really key open doors while they are waiting for the other train because you could be knocked down by train movement as they couple.