yes, normally being a third wheel is all awkward and weird. usually, it says in no uncertain terms, "of course i'm not interested in my best friend's boy/girlfriend." however, everything changes when you aren't being the third wheel, but have a third wheel, especially if it's motorized.
now, all of a sudden, you become big man on the train platform.
well, i guess even the biggest men on the platform suffer days from getting no play. try as trike-man might, the lady was just not buying into his charm. perhaps the obvious 30-yr difference in age had something to do with it. but, trike-man, do not be discouraged. simply remember that you are following in the footsteps of men suffering mid-life crises everywhere. and cher.