Metros~3 are increasingly at the heart of the sustainable development of large cities with a sufficient budget~a-arid they confront decision-makers with weighty decisions. Some are shining examples of what is possible, but many are not the mature, sustainable businesses that they need to be (and that many assume they are); instead they face daunting problems while others are in crisis. Because metros are strategic mega-projects, with great potential for good or ill, this matters. Moreover this situation has not materially changed, advances being offset by an increasingly challenging environment. It has become clear that major change is required, and that consensus behind a new agenda is needed, founded on an understanding of the issues. This article seeks to outline what is needed from this new consensus.
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