https://forums.factorio.com/viewtopic.php?f=194&t=46855



Deadlock analysis
This is pretty much a worst case analysis, the only thing I assume about the rest of the train system is that the output block is properly sized. Trains are allowed to change path at the worst time, basically I'll do my best to make it break. While this is mostly manual analysis I will provide examples of any deadlock from my tests if I'm able.
Here is how I grade how "deadlockable" an intersection is.
  • A - Safe, will not be the source of a deadlock
  • B - Can deadlock if more than one train changes path inside the intersection, may resolve itself if output block becomes free
  • C - Can deadlock if more than one train changes path inside the intersection, requires player to resolve
  • D - Can deadlock if a train changes path in the intersection, may resolve itself if output block becomes free
  • E - Can deadlock if a train changes path in the intersection, requires player to resolve
  • F - Can deadlock in regular traffic, usually caused by loops that can be saturated



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