(I do not want to hear about the co-efficient of friction of steel on steel versus rubber on concrete ~ at the end of the trick you still have to get home from the station).
(Besides, I rode Metro-rail in the DC area for many, many years, still my hitch-hike operation in Springfield was much more efficient for it's users in that 5,000 people per day got free transportation to and from designated commuter pick-up operations in DC.)
(Others have coined the term "slug line" for this activity).
I'd like you to explain this to me in a little more detail, since I don't exactly know what you are talking about.