I had to grab these before, figured I should share.
My main bus (mostly), as well as my rubber/plastic loop.
The main bus is supplied by a large conveyor elevator (manual, still waiting for the update) from basic material production downstairs, with each wing off the side drawing off the material it requires and supplying a new line onto the outside of the bus. In theory, each wing could, therefore, be expanded as much as required to supply enough component back onto the bus for further manufacturing.
I need to boost my raw iron/coal/copper/limestone intake though. Currently running off less-than-pure nodes is limiting my maximum throughput.
And so so keen for "proper" conveyor elevators.