Cars or rolling stock attached to the Jupiter at the golden spike ceremony

From: "Richard Dahl" rjd4cars@centurylink.net

I'm retired and to have a keen interest in model railroading so I'm going to build an HO diorama of the Golden Spike Ceremony and I'm try to find out what cars or rolling stock was attached to the Jupiter at the time of the ceremony. I've seen pictures of what looks to be a box car and coach also a picture supposedly of the Jupiter on its way to the ceremony with a water car, box car and coach.

Any information you could provide would be greatly appreciated. ...

—Rich Dahl