The Dakotas

SOUTH DAKOTA
The mainline ended at Evarts when the decision to build to the coast was made in 1905. The construction of the Oahe Dam in the early 1960s created Lake Oahe which has flooded the townsite.
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This is an article on the Pacific Coast Extension.
northeast.railfan.net
Mobridge is where the Milwaukee Road mainline crossed the Missouri River.
It took [...]

Montana

The Milwaukee Road’s Mainline traveled 746 miles through Montana, and currently 84 miles remains in service. BNSF operates 76 miles from North Dakota to the connection at Terry. They have another 5 miles between Butte and Newcomb, along with short sections in Miles City and Deer Lodge. Trinity Railcar are using 2 miles through the [...]

Idaho

The St. Maries River Railroad are running 20 of the 99 miles that ran through Idaho. Their section is from Regulus to Plummer Jct.
St. Paul Pass is located in the Bitterroot Mountains, which divide Montana and
Idaho in this area. The summit of the Pass is 5,162′. With the use of the 8,771′ long tunnel, the [...]

Washington

Two sections remain in Washington State, accounting for only 41 of the 332 miles. Columbia Basin use 13 miles, from Warden to Othello. Union Pacific own 28 miles connecting Black River with Tacoma.
This is Helmut Wisinger’s guide to Washington State.
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The mainline across Washington State is now the John Wayne Trail. [...]