Board Thread:Questions and Answers/@comment-160.3.46.233-20150816121227/@comment-26518423-20150822025917

The building isn't a waste. It is necessary if you want to collect the Royal Train achievement. You might want to place it in storage (if your city is filling up) until you need to send gifts to additional friends... which helps complete another Achievement.

If you send a suggestion to Support (at the bottom of your page) they may change the wording on the building, I agree, it was misleading and took a lot of time to collect it (and the other Royal buildings).