The system reached its maximum extent in the 1930s, with 37 km of track served by 10 routes, worked by a fleet of 33 motor trams and 26 trailers. In 1945, when the direction of traffic flow on several streets in the city centre was reversed, tram lines 1–4 were closed, but CALT built a new line 5, between the city centre and the neighbourhood of Las Mercedes. The system was nationalized in 1948.
