Board Thread:Questions and Answers/@comment-78.174.12.241-20131208212030/@comment-86.184.175.50-20150624073337

TheRealPella wrote: When achievements and contracts tell you to send a "complete set", they mean everything you can buy for gold. No, it doesn't mean that at all. As you say later, a set requires enough wagons from the set to match the power of the engine. It's not necessary to include every type of wagon, or even every type of wagon that can be bought for gold. The Adler set is a perfect example of this. The locomotive has power 4, so you just need any four wagons from the set. You can just use four Adler 2nd Class and that's fine. You don't need to include an Adler Mail, even though that's available for gold.

Also, note that contracts no longer use the term "complete" when describing sets. A set is not a set if it's not complete.