As Ed suggested they would likely never run more than one engine at a time. We visited this place in April of 1995 as one of the tourist train side-trips in our America By Rail-The West Coast Route.
Max Staufer, was very good to us, and we got a nice segment from our visit there. On one of the runs, Les Jarrett rode the cab of #15, while I rode on a speeder car flat behind one of the Model A railcars. I used a milk crate for a seat and had the camera on a tripod, as we ran ahead of 15 for part of the journey upgrade on the return trip. We included some runbys, and onboard shots, as well as some of the railcars which are rather unique to say the least. #15 even made the cover of our program that year. I recommend it to those going to the Yosemite National Park, or just go see the train and forget the park!!
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Its not very long as miles go, but its mostly all wooded, and there is a loop at the bottom of the grade. I would recommend two trips, one with the steam engine, and one with the railcar. The railcars are open sided, and you face 90 degrees from the rail.
Greg Scholl