The Buenos Aires Metro began operation as a transformative public transportation system, marking a pivotal development in the urban landscape of Latin America. The system’s inaugural line, known as Line A, stretched from Plaza de Mayo to Plaza Congreso and was designed to facilitate better movement through the bustling city. This underground railway project was financed by private investors and implemented by the Compañía de Transportes de Buenos Aires, which showcased the innovative engineering techniques of the era. The use of electric trains was particularly significant, reflecting a broader trend towards electrification in urban transportation during the early 20th century.

The construction of the metro was a response to the rapid population growth and urban expansion that Buenos Aires experienced during this time. The city leveraged this new railway to improve transportation efficiency, reduce street traffic, and promote urban development. The metro's opening was celebrated with great enthusiasm, as it represented not only an advancement in technology but also an improvement in the quality of urban life. The project employed a significant number of workers, contributing to economic activity, and further enhanced the city’s reputation as a modern metropolis.

As the metro expanded, it adapted to the needs of a growing population and became an essential part of city life. Subsequent lines and extensions introduced over the years connected geographically diverse areas, emphasizing the system’s importance in linking communities. Buenos Aires's metro would inspire other Latin American cities to consider similar projects, thereby playing a crucial role in shaping urban transportation in the region for decades to come.