Subway Squeeze - How to play

About Subway Squeeze, from BoardGameGeek:

Pack your carriage with passengers and don't forget to mind the gaps! Take passengers from each station and fill up your carriage before you reach the final stop! Carefully place your pieces to make groups of commuters, tourists, families, dogs and buskers; but make sure that pregnant passengers get a seat and watch out for the ticket inspector. Score points for your different groups and lose points for any gaps left in your carriage. This game is just the ticket! -description from the publisher