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Depending on your definition, this actually is not peak performance.
Subways are.
Obviously, the tunnels are absurdly expensive, but nothing moves as many people as quickly around a city as a subway.
They’re also extremely reliable, meaning people are even more likely to actually use them, and their above-ground footprint is essentially zero.
Subways are for mobility (moving large numbers of people rapidly); trams are for access (getting you close to your destination). They complement each other and a well-designed city would have both.