I'll start with some of the elements, and I'll invite my colleague Mr. Camiré to also provide some elements.
At a high level, once the train goes faster than 200 kilometres per hour, the difference is that you need a fully protected right of way. This means that the tracks are fenced. There cannot be at-grade crossings. That means viaducts over the road. It also means that the curves cannot be as great because the train is going to travel faster—