Here's a comment I posted on TrainBoard.com on Friday the 9th:

Late yesterday afternoon I was driving southbound on Interstate 5 just north of Mt. Shasta when I noticed a southbound string of shiny new tank cars. It was getting dark and I could not identify the locomotives on the lead.
I was going to Dunsmuir anyway and thought I'd stop by the UP facility there and wait for the train to arrive. Dunsmuir is normally the place where a crew change is made.
About half an hour later I heard the horns and another 5 or 10 minutes later the train arrived, and stopped to change the crew. When the train resumed its travel there were four diesels in the lead. First was a very dirty UP unit followed by two Canadian Pacific units and then there was a Nofolk Southern, which I've never seen around these parts.
Behind the lead locos was a single hopper car followed by 97 tanks; and then, much to my surprise there was another hopper car with a Canadian Pacific loco at the rear! I suspect it was there to help going up grades and for added dynamic braking as the train descended the route along the Shasta River Canyon.