Here at Emeryville, the conductors announced to people as they boarded that "This train is Standing Room Only. There are no seats at all." I've had to ride SRO for a stretch -- London to York in 1995 -- and it isn't that comfortable for any length of time. I also did once find myself aboard an SRO Capitol, but in that case I had the presence of mind when I heard the SRO announcement on boarding to dash down to one end of the train and stake out the floor space at the end. That's about the best one can do in such a case because the two ends are the only places you won't have people trying to climb over you while you sit on the floor. Everywhere else, you spend the entire trip dodging fellow passengers.
Emeryville: Scheduled departure 1:55; Actual 2:35