There are certain cities in America that have more than rudimentary tram networks (Boston springs to mind as an example), but in most places if you come across a tram line, it is primarily a curiosity rather than a major mode of transportation. Conversely, many major cities in Europe retain trams as either the principal type of public transport or as the extensive supplement to the subway system, with every address in the city center sitting within a short distance of a tram stop.
When we were in Cracow, we took a number of shots of the passing streetcars. Here is a small selection.