Spokane, Portland and Seattle Railway
The Spokane, Portland and Seattle Railway was a jointly-owned (by the Great Northern Railway and Northern Pacific Railway) freight and passenger railroad in the northwest U.S., and is now part of BNSF. Lines formerly operated by it or a subsidiary should be tagged old_railway_operator=SP&S in addition to railway=rail (if still in use) or railway=abandoned.
See Wikipedia:WikiProject Trains/ICC valuations/Spokane, Portland and Seattle Railway for a chronology (which may have some errors) of lines constructed by the SP&S and predecessors, compiled by the Interstate Commerce Commission in 1915-18.
Below is a list (roughly complete) of ex-SP&S lines, with mapping status.
|47||Portland||SP&S Junction (Kennewick)|
|440||Willbridge (Portland)||Goble||leased from NP|
|442||United Junction (Portland)||Bowers Junction|
|442||Bowers Junction||Forest Grove Junction (Orenco)|
|442||Forest Grove Junction||Beburg|
|458||Forest Grove Junction||Forest Grove|