I know it's impractical. But that just makes it all the more fun if I can pull it off. I'm not asking you to build an automated refiller system - this is what I would do if I were bored. And good point on the exploding carts. I could probably have the assembler machine put down a transition rail after it sends the "I want more stuff" signal and then remove it afterwards, but it would be simpler for me to just use ordinary rails. On the topic of the server, all the mods are now available for us to update (including Advanced Machines). The question we face now is whether we update at all - would anyone still play on the server? I think we need a new thread for this.