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Barcelona had a bunch of interurban tram lines which began operation in the late 19th century, many as steam trams. However many of those lines stopped being interurbans when the towns they reached were integrated into Barcelona between 1897 and 1921. As Barcelona and the outlying towns grew together, the interurbans became proper urban trams over time.
Only one line remained as an interurban until it definitely went the way of the dodo in 1965, that was the line from Barcelona to Badalona via Sant Adrià. And unlike the Vallès line I talked about before, this was more like a regular tram, running on double-track in mixed traffic within the city, and a single-track roadside ROW outside of it. Like the other interurbans, it started its life as a steam tram in the 1883, reaching Badalona in 1885, and was eventually electrified in 1903.
Pic related shows the tram at Badalona sometime between 1903 and 1922.
