> (...) would be dwarfed by the cost of modifying them to use that control system." This should be the top comment. Cost is a critical factor. I would also sto

> (...) would be dwarfed by the cost of modifying them to use that control system." This should be the top comment. Cost is a critical factor. I would also stop riding the bus and drive a Ferrari to work if that option costs as much as a bus ticket. As it doesn't then I'm going to stick with the bus, but this does not make it a superior choice.