My reading indicates, that "Even X could have prevented this." means that X is able to solve the issue on it's own. Otherwise X would in fact not prevent it.

- I don't think X would actually work, without actually eventually recreating part of the current railway control system, and the current rail control system alone already works better.

- I don't think another less reliable more costly safety system helps, when the current one already stated that there is a problem, and it was ignored.