Originally Posted by
goodtimes5
BART doesn't really enforce the no bikes on BART during peak hours rule. I've done it many times, and I've seen others do it without issue. And I'm talking about full road or mountain bikes. My advice for this is to get on the last few cars where people are less likely to be. That way there's more room for your bike, and you won't feel rude having a bike up someone's rear.
I've seen quite the opposite - several times the train operator has refused to leave a station until a bike was removed from the train.