Well, here it is at last. The plans.
The main line just below "C" runs around through the Big town. The town is built on a slight grade sloping away from the window. (that natural light should look food coming in on the town) The main line has 3 ways it can go when it gets to the 3 way turnout at "B".
The track to the left takes the train around the reverse loop to change the direction of the train. This is where the fuel depot would be giving this track an alternate purpose. I always like to incorporate a reverse loop because I like the option of the train running in ether direction without to much of a fuss.
The track to the right takes the train to the Shore line run.
The center track is the main line and goes up to the mountains and the High town.
The Main line winds up through the mountains until it gets to the cut by "G". There it crosses a big bridge ether a trestle or a concrete arch bridge. (right in front of the window)
From there the track climes a little more to reach High town. This is where the coal mine keeps this smaller town alive. Sort of a rustic place. Built on a plateau at the top of one of the mountains. A few sidings there to service the mine and local biz, and a train station on the main line. This is a possible place for a HOn30 mine train, servicing the mine. The mine train would be built 4" above the Main line so it could cross over the Main with ease on some form of an elevated track system, and dump its loads into the waiting cars on the siding in the town.
Then the track winds down the mountain and crosses over the Shore line at "E",an unusual rock formation, then back on the hillside as it descends. The rocky bluff runs out just above "D" and the track descends the rest of the way to the yard on a man made track elevating device of some sort. Could be a trestle. Could be a steel structure. Could just be retaining walls filled with earth.
Now you have a choice. Take the turnout by "C" and go down to the hidden staging yard, or take the line just below "B" and make a trip around the Shore line, or you can back into the yard and change your consist.