26 • Digital twins of utilities networks provide a detailed physical view of systems that are often concealed from view. In the United Kingdom, the wireless provider Vodafone now uses a digital twin that covers 245,000 square kilometers of its network. • Environmental digital twins have emerged to understand ecosystems and how they function. Perhaps their most valuable attribute is the way they link natural systems with human-made systems, revealing how each affects the other. The Cross River Rail project will deliver a new 10.2 km line through Brisbane’s inner city, featuring twin 5.9 km tunnels running under the Brisbane River and CBD. Four new underground stations will be built as part of the $5.4b project, in addition to the upgrade of eight existing stations.
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