Board Thread:TrainStation Information/@comment-26287149-20150407103756/@comment-24094162-20150408100824

Normally you would see the 5 mail packages on friends stations that have the envelopes on them. With one click you would click on one and get 5 packages of mail, based on the level you are.

Currently as Bjorn said, there are easter eggs, where 9/10 (or so) contain materials and the other one contains more mail then usual, so click on your friends stations to get extra mail.