I just saw it this morning and didn't have time to post then. Question #1, what is the point of a "balloon track" going from one leg of the turntable to another leg of the same turntable?
My other comment concerns the track work at the top of the grade to the coal mine. I think you can simplify that track quite a bit. How many coal mines are you serving up there? Since it is a branch line, you can use the branch and a double ended siding one train long as a run around, you might want to make it a double runaround with a second siding at the same place for holding loads you've pulled out while switching in empties. Then put a ladder under the tipple to move empties in and loads out. If you are servicing more than one mine, you could still get by with one run around track and put in a second ladder to the second tipple. A ladder track system consisting of three tracks capable of holding 5-6 cars each for loading under the tipple will make a train 15-18 cars long. Two such ladders will yield a train of 30-34 cars. That is a lot of operation, especially if you are bringing up an empty train, spotting the cars as you pull the loads out for a loaded train going back down grade.