The construction directly had beginning in 1895 in the small Alcobaa, impactando in the way of life of those fishing and castanheiros that its works would leave to participate of it I exercise of workers who opened ways in the forest and raised bridges on igaraps railroad to follow it ahead. Observing the evolution of the city we see that the same it followed the riverbed Tocantins, its main way of communication with the other cities of the High and Low Tocantins. However this development if saw modified in 1895 with the installation of the Company of railway navigation. You take them of migrantes that had invaded the locality had transformed the life way in that they survived basically of fishes, introducing its culture, its customs that had been being assimilated for the messengers. In a process that would be repeated with the construction of the Hydroelectric plant of Tucuru in century XX and would stamp the river the navigation. The navigation of the river Tocantins, can not have reached a significant result in economic terms for the country, but it represented, for a long period, a way of life for the marginal populations, being basic to the supplying of necessary goods to the region as, domestic salt, tools, powder, utensils, fabrics and, to the transport of the excesses that consisted mainly of the oleaginosas rubber, chestnut, seeds, cacao, cachaa and leathers. ' ' To the exchanges of merchandises between the men the exchanges of ideas are followed, pensamentos' '. This affirmation made for Julio Paternostro characterizes well what it was intended to observe in this article, the transformation process reconstruction of the identity of the marginal population in the Low Tocantins throughout century XIX. The modernization process that if operated in the tocantino valley in ends of century XIX affected of drastic form the life of the resident populations that they had a way of generation life, passed the generation, pautado in the forms to make and of being of the messengers.