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A few summers ago, I happened on a historical railraod museum in Mandan, ND, an important division point on the Northern Pacific. Don't remember the name of it, but spent a couple fascinating hours there. They had lots of memoribilia and records from the Northern Pacific and the docents knew their stuff, you may want to contact them.
Another possibility is the Lake Superior Transportaion Museum in Duluth, MN. It's just 10 miles from Carlton, MN, the original eastern terminus of the NP. They have a huge collection.
One more: the James J Hill Business Library in St. Paul has extensive records going back 100+ years on commercial enterprises in this part of the country, particularly railroads. Yes, James Hill was the founder of the Great Northern, the NP's rival, but his namesake museum isn't confined just to his business interests. The librarians are very knowledgable and a phone call my get you some leads on the info you seek. (You may know Hill tried to buy the NP, but back then the trust-busters didn't allow corportations to get "too big to fail". It wasn't until 6 decades later that the NP was merged with the GN.)
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