Dennis just sent me the link to the McKeen at the Nevada State Railway Museum, this was the Virginia and Truckee Railway Motor Car #22

if you were to see the photo below, and no one told you what this was, I don't think anyone would able to guess what it was

Photos from http://vft.org/Museums/McKeenRailMotorCar/McKeen.html  thanks to Dennis!

Two unpowered McKeen trailers survive; one is a storage shed in St. Helena, California. while the other is at the Illinois Railway museum.  https://www.facebook.com/McKeenMotorCar/