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[0.15.7] not able to build a signal

Posted: Fri May 05, 2017 6:13 pm
by fregate84
I have a signal on my hand, but factorio don't suggest or accept the placement of a signal on the straight horizontal rails I just build (on orange side)
Not normal. should suggest & accept the build.

And all work fine with gost build of the signal.
screenshot-tick-57983704.png
screenshot-tick-57983704.png (4.24 MiB) Viewed 3275 times

Re: [0.15.7] not able to build a signal

Posted: Fri May 05, 2017 6:25 pm
by Nexela
The game does not allow you to build signals on the opposite side of one way tracks unless building the signal would make it a two way track.

Re: [0.15.7] not able to build a signal

Posted: Fri May 05, 2017 8:37 pm
by fregate84
it's a 2 way track !!!!

Re: [0.15.7] not able to build a signal

Posted: Fri May 05, 2017 8:47 pm
by Loewchen
Post the save file please.

Re: [0.15.7] not able to build a signal

Posted: Fri May 05, 2017 10:07 pm
by Nexela
Signal in the top left corner. Does it have one on the other side?

Re: [0.15.7] not able to build a signal

Posted: Fri May 05, 2017 10:48 pm
by fregate84
bug.zip
(25.24 MiB) Downloaded 87 times
on top left, it's the exit to 'one way track'

Re: [0.15.7] not able to build a signal

Posted: Sat May 06, 2017 7:12 am
by Loewchen
It is caused by the two latest turnouts to south being close together, even removing all relevant signals does not change this. I assume it is caused by the one signal placement point having no connection to the northern rail:
pic
Edit: Seems to be more complex, even removing the track going NE fixes it.

Re: [0.15.7] not able to build a signal

Posted: Sat May 06, 2017 12:55 pm
by aaargha
Adding a signal as shown also makes it recognize that it is, in fact, a two way rail.
pic

Re: [0.15.7] not able to build a signal

Posted: Sat May 06, 2017 5:07 pm
by Nexela
Which is the signal I asked about in the first post :)

Re: [0.15.7] not able to build a signal

Posted: Sat May 06, 2017 7:44 pm
by aaargha
Yeah, but even without that signal it's already a two way track, due to the chain signal below it. A train coming from the west on the horizontal rail can reach the station with no problems, even if the signal placement options would imply that the track is one way the other way.

Attaching as small a reproduction as I could manage. Adding or removing exits to the south changes which side signals may be built on the east part of the horizontal rail.

EDIT: Repro is 0.15.9

Re: [0.15.7] not able to build a signal

Posted: Sat May 06, 2017 9:13 pm
by MagmaMcFry
That does seem weird. Here's the blueprint string from your reproduction:

Code: Select all

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
Interesting, removing any of the four downward branches makes signals placeable on both sides of your segment again.

Re: [0.15.7] not able to build a signal

Posted: Sat May 06, 2017 9:23 pm
by gheift
How does the track continue on the left side?