optimized from Cookie's https://www.factorio.school/view/-OAT0pighcqh0MWqS9ny
Fully automated train logistics book. This makes trains behave like logistics bots.
Priority is controlled dynamically based on time since last fulfillment, train limits are set dynamically based on buffers and trains are generic and take on whatever job is available. Blueprints are parameterized.
Simply make sure all stations in the network share the green wire e.g. over power poles.