None of the photos with Little Joes are from Washington, that line was never recalibrated to run them. The Little Joes only ever ran between Montana and Avery, Idaho. Many of the photos with just boxcabs could be from Washington state. The Washington line was de-electrified in 1972 IIRC.
Here's a pic of boxcabs running somewhere between Tacoma and Othello, WA. Based on the terrain probably closer to Othello.