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How steep a grade are you shooting for on the branch? If you don't extend the tipple tracks over the main you wouldn't have to get them up to 1.75" clearance. You could also move the branch closer to the main on the left to give you more length, and have it curve almost all the way back to the main in front before swinging to the mine for even more length. You'd wind up with an exaggerated "S". Might be able to squeeze in a truck dump spur along the way. Since this will be a layout showcasing locos and ops, you can use most of the space for track and mountain scenery, with little to no town/industry structures.
@PiperguyUMD,I'm flattered that my version of the Seaboard Central has inspired you. I can vouch that the grade to the mine and the ridge down the center of the layout will work. I do think a passing siding on both sides of the layout will give your ops more flexibility, especially since you want to run multiple locomotives on the layout. Curved turnouts will lengthen a passing siding on the top of your plan.Regarding the mine, it is absolutely prototypical to shove empty hoppers several miles to a mine. Unfortunately, @mu26aeh's idea of a passing siding on the branch won't work well, unless you plan for something to hold the cars on the grade while you switch cars. I think it will feel more rural to forego that passing siding. Just shove empties up the hill (keeping the locomotive(s) on the downhill side of the cut of cars to prevent runaways- this is prototypical on steep grades, too) and pull the loaded cars down the hill. Use the yard as a coal marshaling yard. This will be fun to operate; I enjoy mountain railroading and coal ops. Oh, and don't forget the occasional boxcar of supplies to the mine.Post pics . . . often, please!DFF
In that last post, why not have the main tie directly into the beginning of the branch - at the top left corner of the red oval - rather than having it tie into the yard at all on that end? It would seem to keep the main more pure and avoid that S through the crossover. Just a thought - maybe there's another reason to do it that way? Looks like it'll be fun to run. -Dave