Not being up on my 1971 history, I stumbled into a neat discovery while browsing a wonderful train photo archive. Apparently the Flying Scotsman toured the US in 1971, complete with an entire train. The main photo shows a BN (former SP&S) Alco pulling the train. Who knew that even those of us who model American trains could put the Emerald Night on our layout in context.
For more on these shots, click here and here, and two more shots here and here. These images are from the wonderful collection of Ron V. Nixon, where you can trace the evolution of the NP from about 1910 to the BN merger (as well as several other US railroads of the Pacific Northwest).