Originally thought as a line from Buenos Aires to Campana, it then extended to the provinces of Santa Fe, Santiago del Estero, and Tucumán.

From Recoleta the train ran passing the stations of Belgrano, San Martín (where the company had built its workshops and depots), Villa Ballester.

[2] From this point on the rate of expansion of the company increased and from Rosario the line was extended to Gálvez (October 1886), Rafaela (March 1887), Sunchales (June 1887) (all cities of Santa Fe Province), La Banda (September 1890) and Tucumán (February 1891).

That made Buenos Aires connected with the rest of Argentina for the first time, through a railway that extended to Córdoba, Tucumán and Santiago del Estero provinces.

By the mid-1890s the BA&R was the second largest British-owned railway company in Argentina and was effectively challenging the Central Argentine's monopoly of the north-west of the country.

On 20 September 1900 the BA&R bought the 490 km metre gauge rail network built by the British-owned company Santa Fe and Córdoba Great Southern Railway (SF&CGS).

The sale included a concession already granted to the SF&CGS for the extension of their network from La Carlota to Río Cuarto cities of Córdoba Province, which the BA&R opened on 26 March 1902.

the construction of a railway line from Belgrano to the city of Las Conchas (current Tigre) with the purpose of competing with FCN.

In April 1889 works began until at the end of the year, the company suspended its activities due to lack of credits As a result, Emilio Noguier decided to sell the concession.

Sections finished were as follows: The path ran in parallel to the FCN (that had been purchased by Central Argentine Railway), to difference homonymous stations, such as Belgrano, San Isidro, San Fernando and Tigre, the Central Argentine line added a "C" to the names, while the BA&R added a "R".

It was in part achieved when CAR purchased FCN, although BA&R had been running services between both cities since 1886 with a short journey time.

The name of the company was not defined either, so the locomotives showed the BAR ("Buenos Aires al Rosario") or FCCA ("Ferrocarril Central Argentino") on their sides.