I see.
Obviously, there are many different kinds of networks. Members of the public ask us many questions about viaducts. All of this must be factored into the cost. The greater the number of viaducts, the higher the costs. Add to that the fact that signaling systems are now fairly advanced.
I'd like to know how far advanced your technology is, given all of the obstacles that will present themselves. Whether you're dealing with the safety of an overhead rail line or of a track at ground level, whether there are viaducts or not, there is really nothing that worries you here. You've already dealt with these considerations and you are capable of handling anything that comes your way.