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The Big Burn
- In the summer of 1910, the largest fire in American history raged in the Northern Rockies.https://www.pbs.org/wgbh/americanexperience/films/burn/#part01
https://en.wikipedia.org/wiki/Great_Fire_of_1910
https://en.wikipedia.org/wiki/Ed_Pulaski
Wallace, Idaho has an interesting history. It served as a major industrial hub in the late 1800s and early 1900s, serving area mines and timber lands.
https://en.wikipedia.org/wiki/Wallace,_Idaho#Transportation
In its prime, two railroads served Wallace. The Oregon-Washington Railway & Navigation Co. (Union Pacific) reached Wallace from the west, offering passenger service to Spokane and Portland until about 1958, and freight service to Spokane as late as 1992. The Northern Pacific Railway approached Wallace from the east with its branch over Lookout Pass to the NP mainline at St. Regis. The former NP depot still stands (although relocated 200 ft from its original site to avoid demolition during freeway construction) and is listed on the National Register of Historic Places.[40] It currently functions as a local railroad museum. The former NP line was abandoned and removed between St. Regis and Mullan in 1980. Union Pacific continued operating the Wallace-Mullan segment of the NP line until abandoning the entire Plummer-Mullan route in 1992. After abandonment, this segment of former UP and NP lines was developed into the Trail of the Coeur d'Alenes.
It was an Oregon-Washington Railway & Navigation Co. (Union Pacific) train that evacuated women and children from Wallace in the 1910 fire.
The Northern Pacific Line came over lookout pass; it was not a direct line, but rather a switchback, meaning a train heading west to Wallace had to pull ahead of a switch upgrade from Mullan, Idaho, and then back down the grade into Wallace through Mullan. Leaving eastward, the train would have to back up the hill past the switch, before heading forward to St. Regis. When NP abandoned the line to Wallace, the competing Milwaukee Road was abandoning their Pacific Extension Line from Seattle/Tacoma all the way back to Terry, Montana. The mines in the region were depleted, so there was not much rail traffic to Wallace.
A bit of trivia: The Chicago, Milwaukee, St. Paul & Pacific (aka The Milwaukee Road, reporting marks MILW) mainline ran parallel with the Northern Pacific (NP) mainline from Butte, Montana through Deer Lodge, Garrison (another NP mainline came in from Helena, MT at Garrison), up the valley through Missoula to St. Regis. The MILW main line continued on to Taft, where it turned upgrade to head over the mountains at St. Paul Pass through the St. Paul Pass Tunnel (aka Taft Tunnel) to Avery, Idaho, and following the St. Joe River and valley to St. Maries, ID and eventually Plummer, ID before entering Washington State. At St. Regis, the NP mainline turned north then northeast to follow the Clark Fork River to Paradise through Thompson Falls (both in Montana) and eventually to Sandpoint, Idaho, where it met with the Great Northern (GN), and both running southwest to Spokane, Wa. The GN and NP merged with the CB&Q and SP&S in 1970 to form the Burlington Northern (BN) Railroad. In 1981, both Northern Pacific (branch line) and Milwaukee (mainline) railroad tracks were removed from St. Regis west.
https://en.wikipedia.org/wiki/St._Paul_Pass_Tunnel
https://www.saintregismontana.com/history.html
https://www.sandpointonline.com/sandpointmag/sms95/railroading.html
When the Union Pacific abandoned the Plummer-Mullan line in 1991, it was faced a huge cleanup cost because the right of way was heavily contaminated with lead, zinc and mine waste. So the UP agreed to pave over the land creating the Trail of the Coeur d'Alenes. The UP continues to serve Plummer, and what's left of the MILW line from St. Maries to Plummer continues to operate as a short line, St. Maries River Railroad.
https://en.wikipedia.org/wiki/Trail_of_the_Coeur_d'Alenes
https://en.wikipedia.org/wiki/St._Maries_River_Railroad
The only way the rail lines in Wallace, ID would have been economical is for the NP to bore a 3-4 mile tunnel under Lookout Pass, and eliminate the switchback. However, since UP and NP (later BN) were competitors, it was not practical for NP to invest in a tunnel.
Wallace is at an elevation of 2,730 feet above sea level. Mullan further east up the valley is at 3,278 feet. Lookout Pass is about 4711 ft, and a tunnel could have been built at an elevation of ~3700 ft (or 3600 ft) under the ridge where Lookout Pass is located. The challenge for the tunnel would be on the north side of the ridge where it would cross the South Fork Coeur d'Alene River. A rail line would have to meet the old NP right of way (which is now a hiking trail) just east of Shoshone Park in Larson, Idaho.
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