The Buenos Aires & Ensenada Port Railway (BA&EP) (in Spanish: Ferrocarril Buenos Aires y Puerto de la Ensenada) was a British-owned company that built and operated a 5 ft 6 in (1,676 mm) broad gauge railway network in Argentina towards the end of the nineteenth century.

[1] Initially known as Ferrocarril de La Boca, works began that same year from the corner of Paseo Colón Avenue and Venezuela street, where currently Escuela Otto Krause is placed.

The station, located on the corner of Paseo de Julio Avenue (currently Leandro N. Alem) and Piedad street (today Bartolomé Mitre), consisted of a modern building made of wood and brought directly from Great Britain.

The train crossed over Riachuelo through an iron bridge that was destroyed by flood in 1884, being quickly replaced by another one made of wood.

[3] BA&E finally reached Ensenada on December 31, 1872, being President of Argentina Domingo Sarmiento one of the passengers of the inaugural service.

The government of Buenos Aires Province decided that La Plata needed to be connected to the rest of the country by train.

[4] In 1888 BAWR sold the Rufino de Elizalde – Magdalena branch to a newly formed company, "Buenos Aires, Ensenada & Costa Sud Railway" (BAE&SC), which was owned by BA&E.

The operation of a port in the main city of Argentina caused a severe crisis to BA&E due to the commercial activity moved to Buenos Aires instead of Ensenada.