Yep, you need walls, guns (hopefully laser), and roboports around your rail system. You need the electricity ANYWAY for running your mining rigs, unless you use trains carrying steam, which doesn't scale well. You might as well put in the roboports so the robots build it for you. In terms of what you need it for, it's throughput/resource ratio. Trains and rails are cheap, belts are not. If a mine dries out I can just abandon it, instead of trying to reroute miles of conveyor.
I have play bobs+angels to endgame twice...
Trust me, trains are bae. You only need 6 blueprints for almost everything. Loader station, unloader station for materials and fluids respectively, straight section and roundabout. Don't bother with 't's and turns. Just stick a roundabout Everytime you change directions.
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