electrical breakdowns are usually related to malfunctioning relay switches which control and regulate the speed of trains. this was evident in the recent breakdowns of the bart system going through the transbay tube. most of these relays are near-impossible to maintain and repair in a deep long tunnel, akin to someone having inflammations in the rectum or small intestines. you have to probe deeply and longingly to find the root cause. the smrt and pappie elites must be lauded for their excellence in tracking down the root cause, finding the problem, and fixing it. meanwhile, the equipment problem in the bart transbay tube is not fully fixed yet, as it requires a total changeout or upgrade. sinkies should consider themselves lucky.