The queue up idea was suggested long ago, but was rejected
because it would cause it would take additional time for passengers
to board.
Despite the mayhem at boarding and alighting the
present "barge in / force your way out" is the
fastest.
The other suggestion of separate In doors and Out doors,
would be slightly better than the queuing.
Queuing is bound to fail, because the guy behind will want to
board the train and the one infront want to wait for another train,
and the queue will break up.
