It's not the track that breaks down, it's what runs on it. I don't see a reason why the electricity or signaling infrastructure can't be redesigned to have redu

It's not the track that breaks down, it's what runs on it. I don't see a reason why the electricity or signaling infrastructure can't be redesigned to have redundancies built in. If the aim with modernization is to replace old signals by new signals and still have just a single signal, that is still inviting calamity.