These cars were built by Belgian company La Brugeoise starting in 1913 and were refurbished in 1927 when their wooden structure was modified for underground-only use.

During the first decade of the 20th century in Buenos Aires, road traffic had sharply increased due to a growing population.

Buenos Aires thus became the 13th city in the world to have an underground railway, behind London, Athens, Istanbul, Vienna, Budapest, Glasgow, Paris, Boston, Berlin, New York, Philadelphia, and Hamburg.

The outside southern track of the subway was eliminated in 1926 and it was decided to extend the platform to make the rail-underground transfer more convenient.

This 2 km (1.2 mi) route has been used since 1980 by the Asociación Amigos del Tranvía (Association of Friends of the Tram) to run the Buenos Aires Historical Tramway.

The ramp had originally taken passengers to the surface at the intersection of Lacarra and Rivadavia Avenues where trains continued to run at street level, a service that ceased on 31 December 1926.

As part of the opening ceremony for the two stations, Buenos Aires Mayor Mauricio Macri drove one of the La Brugeoise trains.

[17] The latter was noted for its extravagant interior design, featuring exotic materials and UEC sent four of these trams to Buenos Aires for the AATC's consideration.

Spare parts for these trains were no longer available on the market so they had to be custom-made by request at Polvorín Workshop, where La Brugeoise units and other Buenos Aires Underground rolling stock were maintained and repaired by highly skilled and qualified personnel.

At this point, it was already being discussed that these surviving vintage cars could continue operating as a tourist attraction on holidays and Sundays.

[20] According to Metrovías, the Buenos Aires Underground private operator, the La Brugeoise cars underwent a routine check-up every 20 days, while every four years heavy maintenance was performed.

Despite their many years of uninterrupted service, La Brugeoise trains had one of the lowest mechanical failure averages in the network: 19 every 100,000 km.

[22] In December 2013 a law was passed which meant that the entire La Brugeoise fleet would receive protection status and would thus only be donated to organisations dedicated to their restoration and preservation.