I've started and re-started Factorio several times, and always enjoy it... up the point where an automated train network is necessary. Here, I always run into problems, and no amount of researching or fettling of the setup seems to guarantee that my trains work. Sometimes they do... often, I have to drive them manually.

Anyway, if you like Factorio, you might also enjoy Mindustry: simmilar-ish, less constructional depth, more tower-defence and fighting.