i understand the simplification and why the reactor produces steam directly, instead of having a primary and secondary plant, but why would power of the reactor be controlled by the circuit network instead of by steam demand? A 1960s era Water moderated reactor adjusts power to maintain a constant ...

In ascii:
..s>^..
>ss\^/>
>s>\^/>
>s>\^/>
>ss\^/>
..s>^<.

s is a splitter >,<,^ are conveyers of the direction, \/ tunnel entrance and exit.

When you have taken enough branches off the bus to narrow it, I think a small mod can be used to break off an entire belt with half the total throughput ...

You can do it by splitting off from all four lanes into a one-sided full-density branch line, instead of from one of the bus lines into a double sided half-density line. Two splitters to balance the outside lane with the adjacent inside lane, then split off of both edge lanes and edge-insert into ...