Board Thread:Questions and Answers/@comment-97.116.50.124-20180902165859

Is there some sort of unwritten protocol or etiquette that we should send something back if one of your game friends sends you an international train?

I've started getting quite a few of them now and feel that I should be sending something back in kind, but don't know if there's some way (other than messaging them directly) to tell if they are expecting something back, and if so if they're looking for something specific.

Just wondering if there's some sort of "code" to tell if/what someone wants back? 