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The first tramway in Lisbon entered service on 17 November 1873, as a horsecar line. On 30 August 1901, Lisbon's first electric tramway commenced operations. Within a year, all of the city's tramways had been converted to electric traction. Up until 1959, the network of lines was further developed, and in that year it reached its greatest extent. At that time, there was a total of 27 tram lines in Lisbon, of which six operated as circle lines. -Lisbon 2011-

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