Looks like a promising start.
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If you really want to have 3 trains going at once you’ll need to modify the city area to not require the 3rd train to come out on the inner oval to go from the roundhouse lead to the industry lead.
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That switchback will be a pain to deal with since using the run around will foul both of the main tracks.
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Unless you’re in love with the roundhouse and turntable perhaps a 3 track yard could use that space (with yard ops being that 3rd train)? Or run a short branchline around one end of the layout to the country side. Let it serve a grain elevator or mine or ?
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Making the run around a bit longer will let you deal with longer trains.
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If sectional track is what you’re comfortable with, then by all means go ahead with it. But flex track will give you a lot more planning flexibility (and with fewer rail joints it should be a bit more reliable).
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The idea of making the backdrop/divider curved or offesting it seems like something to look further at (to me anyway). It might allow some more interesting scenic opportunities.
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Putting another cross over on the country side of the layout might allow for a bit more interesting operation.
Looks like you’re going to have fun with this one.
And don’t feel bad about the first layout not turning out the way you’d hoped. If we all waited until we had perfect track plans before building anything, nothing would ever get built.
When I had my 4x8 layout I made a bunch of ‘tiles’ by cutting 3/4" plastic I-beams into 1" long pieces. I labeled each piece with the name of an industry and stuck 'em in a small container. When I wanted to do freight switching I’d pull the freight train into town then pull tiles out of the container and set them on top of cars in the train. Then I’d deliver those cars to the industries the tiles said they should go to. If there was already a car at that industry I’d pick it up. Af
