This might be particularly interesting because this nominal date is around the time period that the bipolars were extensively rebuilt and improved.
"Good lord, you guys do know how to take the fun out of something."
- Ed Kapuscinski, RyPN, 10/9/2014
Noel Holley's book, The Milwaukee Electrics, had a schematic of the 3,000V distribution system for both the Rocky Mountain and Coast electric zones. This includes a couple places on the line between Avery and the summit where feeders were run across Loop Creek. The boook covers the addition of two M-G sets bought from CUT to bolster the electrical system.
Michael Sol's website has a lot of documents on the electrification as well.
Former forum member.
His website is called Miiwaukeeroadarchives.
You are quite welcome.