I found a DVD, at a swap meet, with digitally converted 8mm color footage of Spokane Portland and Seattle trains between Vancouver, Washington and Wishram, Washington. I believe this is the SP&S 1st Subdivision.
There are caboose rides, cab rides, and footage shot from the ground. Alot of the footage is shaky but there are some excellent scenes as well.
Highlights include an SP&S hi-rail automobile, a Northern Pacific tail-car, re-alignment near The Dalles Dam, and a "hotbox" fix.