Tickets are crucial to winning the game.
When you successfully connect Cities listed on a Ticket using a continuous set of your own train Routes, you Score the points listed in the Ticket's lower right corner.
But Beware: If you fail to connect a Ticket's Cities by Game end, you lose these points instead of gaining them!
To see a Ticket's Cities, simply press your finger on the Ticket and the Cities will automatically highlight themselves on the map!