You can certainly die by electrocution. I don't know the specifics of what you're talking about with these buses, as far as how much voltage and amperage they use, so have no idea if it would be enough to kill you. But, people have and do die from by being electrocuted all the time. I don't think it's a pleasant death, though. They did away with the electric chair here in the US years ago for death row inmates because the courts ruled it was cruel and unusual punishment. I think your insides literally fry. Even your nails can pop off. It's like torture. Most people looking to kill themselves try and find a more peaceful method. Had a friend years ago die by electrocution. He was an electrician. He was up on one of those "boom", or lifts, from a truck and the boom accidentally made contact with high voltage wires. Not sure his death was instant, or not, tbh. I'm sure coworkers and rescue workers, at least, tried life saving techniques. And I don't know what it felt like for him, and don't want to know, really. Sounds like a brutal way to die.