> Also, BART doesn't share tracks with any other system, so there's no reason to do it for compatiblity's sake either. Isn't that a chicken/egg issue? How coul

> Also, BART doesn't share tracks with any other system, so there's no reason to do it for compatiblity's sake either. Isn't that a chicken/egg issue? How could BART share tracks with systems using incompatible rails?