Wow, talk about a single point of failure when an issue in the systems of one station can stop all but one train line. Interestingly, it seems to be a station w

Wow, talk about a single point of failure when an issue in the systems of one station can stop all but one train line. Interestingly, it seems to be a station where tracks from six directions meet so a backup mode of trains simply passing through might be impossible: https://en.wikipedia.org/wiki/Madrid_Chamart%C3%ADn_railway_station https://en.wikipedia.org/wiki/Madrid_Chamart%C3%ADn_railway_...