Since the late nineteenth century, in the capital of San Juan Province, Agustín Gnecco begins to form a huge collection that would occupy several rooms of the family home. This set of objects includes archaeological materials, archives and historical documents, weapons, coins, artworks, religious elements, among others. During the 1940s, after his death, a large part of this iconic collection ... [Show full abstract] named Collection Gnecco was transferred to what is now the Complejo Museográfico Provincial Enrique Udaondo in Luján City, Buenos Aires Province. The negotiations, talks, collection packaging and conditioning for this transfer were conducted by Enrique Udaondo (director of the Museum) and Anavadro Gnecco (son of Don Agustín) through letters and documents, preserved in the Archivo Estanislao Zeballos. Through these documents, this article retrieves the details of the trip in train carriages from the capital of San Juan to the Museum of Luján and the inauguration of Pabellón Gnecco, built to host the endless collection. Also, starting from this particular case, we can reconstruct some forming collections, collecting networks and objects that change their meanings while moving throughout the national territory.