Rochester has a rich history of transport networks that are literally layered on top of each other.  The following images illustrates snapshots of this evolution.
Erie Canal
Subway rail tracks over aquaduct [Broad Street]
Cars over the aquaduct [Broad Street]
In addition, there was also an extensive trolley system within the city before the introduction of the subway.
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images from http://www.broadstreetcorridor.com/gallery.html and http://www.shorpy.com/search/node/rochester
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