Their first job is to go to Santiago or Córdoba to buy the mules.
In order to meet these demands the Córdoba breeders had developed production.
At Córdoba, the curve of the rainfall indicates a typical tropical regime, with a summer maximum and a very low minimum in winter.
Martin de Moussy mentions the digging of wells on the new road from Córdoba to Rosario, which was opened about 1860.
Córdoba and Santiago del Estero seem to have been important in connection with the industry of breaking in the mules.
Conveying a load from Rosario to Córdoba cost forty to fifty piastres (eight to ten pounds).
The influence of Buenos Aires spread over the interior and, in spite of the Córdoba tariff, reached the regions of the north-west.
The line from Rosario to Córdoba is, therefore, the chief branch round which the Argentine system developed.
But the Central Córdoba was a narrow-gauge line, expensive to use and necessitating a transfer of goods at Córdoba.
The 1855 concession authorized Wheelwright to extend the Córdoba line westward and link it with the Copiapo line.