Along with the horse car,which mode of transportation first allowed late-nineteenth-century cities to expand into the suburbs?

Question

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The electric streetcar, also known as the trolley, was a major mode of transportation in the late nineteenth and early twentieth centuries. It allowed people to travel quickly and easily between the city and the suburbs, which in turn led to the expansion of cities into sprawling suburbs. The automobile did not become widely available until the early twentieth century and did not have as significant an impact on suburban expansion as the electric streetcar. The subway mainly served the central areas of cities, and buses were not widely available until the mid-twentieth century.

Along with the Horse Car,which Mode of Transportation First Allowed