Oops sorry for duplicate, I search everywhere... but not for on 0.14 forum, because for me it's a real bug, not a feature (the logistic network have no sence if train path finding don't respect the signal).

When using Train signal connected to logistic network (red/green wire), if the train signal is red because of the logistics datas the train path finding ignore the stop, and the train will stop instead of use other another path:

http://upload.factorio.org/images/factorio/factoriotrainpat.jpg
On ...