The most unhinged ways to transport items and yourself around your factory. Fling items around with Thrower Inserters, launch your trains off ramps, and soar through your base on electric ziplines!
I decided to have them not adjustable because if you could then you could just put all your assemblers in a line and fire items between them freely down the assembler "stack", which felt pretty boring. Having it fixed at 20 I feel forces you to be more creative with it
I never actually tested this though, it's just a thought I had way back when I first designed it. Maybe I could have a mid game research that lets you adjust them