Factorio Forums

When an automatic train begins to enter a signal's block, that signal turns yellow. If the train stops and backs out before the signal turns red, the signal will remain yellow, and ignore any circuit input.

Initial setup:


Train goes to station on right, stops before the lead locomotive completely passes the signal:


Train leaves for station on left, signal at bottom right stays yellow:


The presence or absence of any other signals before or after the stuck one makes no difference that I can find.

The signal, theoretically, should have switched to red (since the train technically entered the block being protected).

I have a feeling that the fix for this will wait for 0.14, due to it potentially requiring a rewrite of how the block signals operate.

Thanks for the report,

I can confirm the issue,
The train must come to a complete stop in my case for the signal to be stuck yellow:

Fixed for the next release.

TruePikachu wrote:The signal, theoretically, should have switched to red (since the train technically entered the block being protected).

I have a feeling that the fix for this will wait for 0.14, due to it potentially requiring a rewrite of how the block signals operate.

Literally a one line fix, please don't assume anything about the internal workings of Factorio.

Is it the same problem?: It happens more and more often nowadays. Putting a piece of rail anywhere or toggling train's auto-mode fixes this problem, until it occurs again.