I can't figure out trains, so I resorted to only conveyor belts and logistic robots. Currently at 35k bots, and increasing the count regularly. : r/ factorio
factorio - Reliably mix 3 ingredients for a factory - Arqade
Factorio Prints: All you need bot-based Mega base. v1.42 - 500spm raw to science, 1300/m raw to circuit, Lv3 modules, refineries, power, mall and more.
Factorio Bot Keychain Construction Bot Logistics Bot - Etsy