Board Thread:Questions and Answers/@comment-33043564-20171006172722/@comment-26828130-20171007013139

All reward items are/were indeed a requirement for contracts and/or achievements, ans as Rolf said, don't take storage space. These items are quite easy to recognise by the amount numbers in green. Items bought with gems also have amount numbers in green and don't take storage space. If you store as much wagons with amount numbers in black in depot behind your biggest (unused) loco's, you save alot of storage space.