Board Thread:Tapped Out Help/@comment-173.240.24.197-20160825085633/@comment-26561761-20160825205630

The second tunnel is the final prize of the fifth week of the Rail Yard Weekly Prizes. At least it'll take you five weeks to get all special prizes. Remember that if you fail to complete a week it'll reset again until you complete it, which means that fifth week will get delayed more and more for you.

The five weeks are personal to on each player. Players that never failed to complete all weekly prizes since the release of the Expansion can unlock the second tunnel this week.