I asked my instructor today about how power outages affected the signal system. He told me that they didn't, and I believe him. But I continued to ask-What about when, a few summers ago, there was a blackout from northern Ohio to New York? Whole entire cities and parts of states didn't have power. I wondered if this affected the signal system and if the RR had to go to TWC authority. He told me he didn't think so but wasn't sure. If anyone knows if it did affect signals let me know. Also if it didn't, how do they maintain their power supply.