Despite my best efforts, I have been unable to find any information on A TRIP TO SALT LAKE CITY whatsoever, although I have seen this early, silent, play on Mormon polygamy.
The film is set aboard the sleeping car of a train bound for Salt Lake City. As it opens, several women and their children enter with a conductor and are shown to their sleeping bunks (behind curtains). Moments later, a Mormon man enters, and is bombarded by all his wives and children. The man gets on his hands and knees and gives the children a horsey ride. We see from his face that he is not happy about it. Everyone goes back to their bunks and the man leaves the car only to return with a large can of milk with several rubber tubes sticking out of it. He hands the hoses to everyone in the various bunks and feeds his rather large family.
I can only assume, since this was an American film made in 1905, that it was an Edison and Co. production, although not their best. I would only recommend it as a look as the first film about religion.