In these positions rail signals appear to make sense visually and spatially but their placement is nevertheless prohibited.

Please see attachment. These signals blink yellow-red-green. I strongly believe that the one on the left does provide enough space for the junction to work as expected while the one on the right could simply create a stopping position at the junction.

I wanted to build some rails to complete an intersection. In this configuration building rails with shift pressed makes the rail planner suggest placing overlapping impossible supports.

I have tried using Fusion Reactors as a modded reactors that take in water and output steam. This not only yields wrong amount of steam compared to boilers (which may make sense since 1:1 can well be the hard-wired default), it also produces steam with temperature that doesn't seem to make sense ...