The UEC Preston is a tram/subway car built by the British manufacturer United Electric Car Company for the Anglo-Argentine Tramways Company (AATC) in 1912 for use on its then newly built underground tramway in Buenos Aires, which was later to become Line A of the Buenos Aires Underground.

Ultimately, the AATC would settle for the more economical La Brugeoise cars, though the 4 Preston trams still remained in service on the line.

One notable example was a convoy used to transport Edward VIII (then Prince of Wales) and other officials during a state visit to Argentina in 1925.

After the retirement of the Preston cars, they were briefly brought back into service in 1983 to take officials from the Argentine Congressional Palace to the Casa Rosada for the inauguration of President Raúl Alfonsín when the country returned to democratic rule following the collapse of the National Reorganisation Process junta.

All three remaining cars are now stored in the Polvorín Workshop and used on the Buenos Aires Heritage Tramway, and also on Underground Line A during special occasions, such as for the 100-year anniversary of its opening in 2013.