A lot of things they talk about are already connected, using company networks. They do not have to use an open internet connection, that can be breached. Train companies, for example, have an internal network that connects all trains, as well as rail sensors. Japan even has wind and earthquake sensors along the tracks. They even have bearing heat detecting sensors, to prevent overheating bearings from causing crashes. Shipping companies, air transport, and many others, are already connected using proprietary networks. That may not change for a while.