By the mid-nineteenth century, the territory of present-day Argentina was still a sparsely settled network of towns beyond which lived some native peoples. In 1860 the incomplete Martin de Moussy survey estimated a total population of about 1 million inhabitants; a decade later the first national census recorded about 1.8 million. Halperin Donghi summarizes the situation in “A Nation for the Argentine Desert,” the prologue to his classic work about this period.1 At that time, the country lacked roads, and the traditional transport system, as Enrique M. Barba describes in a pioneering book, consisted of cart tracks that were impassable during the rainy season, and some staging posts that provided rudimentary services for long-distances travelers.2 Indigenous trails trodden by livestock, called rastrilladas, supplemented them.3 Years later, Cristian Werckenthie studied the traditional transport of the pampas. Bullock carts were the principal means of transport; elsewhere, mule trains were the norm.