>>889249The southern half of the line south of Sacramento completely de-electrified after 1957, following a major trestle collapse and the decommissioning of the SN's rail ferry "Ramon" across the Sacramento River. Other sections had been de-electrified from the 1930s onward. SN was a subsidiary of WP and dieselized around the same time as its parent company. IIRC the last section of track to de-electrify was the stretch between Marysville-Yuba City. Electric freight operations north of Sacramento lasted to some extent until 1965, interurban passenger service was discontinued by the early 1940s. Also important to note is that there were significant portions of the former Northern Electric that were third rail, and some remained so up until the last days of electrification.
If you are a fan of interurbans you definitely have to visit the WRM at least once, they have an amazing collection of restored streetcars, trolleys, freight motors, interurban cars etc. from around the country, and a lot of that is operational and on display.
Also if you are interested in the SN check out this website:
http://www.wplives.org/sn/index.html 