I've boarded about 30 mins in advance at BOS. Of course it was a weekend and the attendant came up with some lame excuse of... "If you want priority boarding you can get a red cap and they will put you on the train". I thought the CA BOS attendant was supposed to take you down to the train? :angry: Lost out on $5! I'm not going to be a jerk and not tip the Red Cap!
Boston attendants are a mixed bag, and it depends in part also on the number of people in the lounge and the current policies of management in Boston. Last I knew, it seemed more like if they had several people in the lounge for that train then they would escort you down as a group. Otherwise, if it was just 2 or 3, they'd tell you to go down on your own. If they don't escort you and you opt not to get a Redcap, you can show your FC ticket to the attendant at the gate to skip those waiting in line for general boarding.
The best, and safest way, is to get a Redcap in Boston. They'll get you out to the train about 30 minutes before departure. That guarantees your choice of seats and assuming a good FC crew, you can generally have your first drink in hand before the masses start boarding.