A lovely old map showing Mexico City’s extensive tram network in 1910. Solid red lines are electric street-running trams, ticked red lines are electric trams on exclusive right-of-way, while green lines are humble mule-pulled trams… of which there are still quite a number. In fact, mule-pulled trams continued to be used in Mexico City up until the 1930s. Electric substations, mule stables, carbarns and other company properties are also highlighted on the map.
Streetcars hung on longer in Mexico City than many other North American cities, with the last line – by then running old PCC cars – only closing in 1984, and being replaced almost immediately by a modern light rail line.
More information on the history of streetcars in Mexico City over on Wikipedia.