Description
For instructions, discussion, and the most current version, see the factorio forum post at - https://forums.factorio.com/viewtopic.php?f=194&t=103418
This is a prototype design I have been toying with to achieve something we do IRL all the time.
Imagine that we have our main base area and out somewhere in the distance we have an outpost and that these two things are connected by single track with bi-directionally running trains.
In factorio land, we handle that with a chain signal and only one train is allowed on that stretch of track at a time.
IRL, there really isn't any sort of problem with sending several trains down that line at the same time so long as they're all running in the same direction.
So, I built some circuit stuff to emulate this behavior.