Below, other than the trunk, the pictures are from eras later than what I'm writing about, but just as fascinating. The second picture displays different seats from different train companies in an early 1900s coach. The third picture is sleeping quarters with a hide-a-potty. The last is from a personalized car. Wealthy people bought their own cars and made them magnificent; kind of like we do nowadays with RVs.
Hopefully, I've gained enough information to keep from writing a serious error in my story with regard to travel via train in 1878.