> but the metro is at least an order of magnitude (if not more) more expensive to operate Many metros, specially the automates ones are really cheap to operate

> but the metro is at least an order of magnitude (if not more) more expensive to operate Many metros, specially the automates ones are really cheap to operate. If you compare capacity and cost then metro lines are far more efficient. A lot of old tram lines are simply done by buses. Often even electric buses. I'm all for more trams, but they are just one part of a much larger transportation system. Using them as the primary center to outskirts mechanism isn't a good idea.