GNRW through the cascades.
1) When the first line was built: it had 4 switch backs on both sides of Steven's pass. The line also had a horseshoe tunnel at Martin creek. Engines on both ends of the train and very few cars: 10-15.

As a not-so-closest fan of the "Link n' Pin" era in US railroading, I find that absolutely amazing. What an amazing V scale "mini route" that section would make!
Andre