Sorry, but the electrification had been removed quite a few years before the line itself was abandoned. Not sure, but I think it was 3kv DC, different from anything else in North America.If you ask me, Amtrak missed a large opportunity to have a long electrified line when the Milwaukee Road line to Seattle went bankrupt and was abandoned.
Milwaukee Road's electrification crossed five mountain ranges covering 656 route miles of their main line in two separate divisions: 440 miles between Harlowton, Mont., and Avery, Ida., 216 miles between Othello, Wash., Seattle and Tacoma. They even had their own power stations. No railroad company picked up the route and it probably could have been picked up on the cheap. Much of the ROW is still there but not much else.