Board Thread:Fun and Games/@comment-46.7.100.103-20140219184509/@comment-26518423-20150822025302

This must have changed since Feb 2014. Flags can be purchased in your shop, sent to you by friends (inclucing Mr Bill), and by completing the occasionally offered special achievement.

If you have reached your max limit on flags, you won't be able to collect the flag from your gift box, but "Collect All" will place it in storage. Apparently they have a limited shelf life in storage, so use the best ones first. Some players (myself included) have seen flags disappear from storage.

The Category "flags" will fill in the details. http://trainstation.wikia.com/wiki/Category:Flags