The northernmost "major" town on the railroad in Wyoming is Lovell (take that with a BIG grain of salt - I am talking about Wyoming, here. Lovell's population is around 2,200).
The track arrangement for Lovell:
As with many of the other towns on the layout, this doesn't represent what Lovell's track arrangement will be when complete, but just shows the passing siding and a couple of spurs. It also shows the bentonite plant as one of the Lovell industries, but I've found some data that indicates the plant wasn't built until the 1950s, so I may replace that plant with a different industry.
Lovell has a very interesting rock wall at the north end of town, between Lovell itself and the Bentonite plant. If I just put it on the layout without explanation, it would look like some sort of ill-thought-out scenic divider. But it really exists (see "The Real Lovell" page) and is an interesting scenic element. It will, of course, be incorporated into the layout.