Same problem for me. I have all track with electricity… but after latest update its not possible to get correct color routing on Mac version of the game.. Even I know that the whole track is electrified. But still the game chooses only one track of the double track I’ve created.
I know that everything is electrified. I even created the tracks from scratch again, but still I have the same issue.
Any chance of uploading a copy of you save game? I can’t say I have had such an issue, its always been ‘user error’ for me when it did happen.