I mostly go for 1-4 trains with a two way rail network, because it has high throughput.
Right now I am playing a rail world with 1-8 trains and single rail, for the challenge.
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Usually start with 1-1s and stick to that.
Depends on the map and base, though. Never had a huge megabase that needed more than 1-2s with LTN mod
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I tried building a grid with two-lane intersections, my trains weren’t able to plan routes where they need to go around a grid cell and turn around (which was definitely possible without using the same rail twice), then I tried troubleshooting it for 1-2 hours and decided to give up on trains until I need them to bring in ore from far away.
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