This paper presents an automatic process to load the transport information of Lima - Peru city as network and public transportation routes from OpenStreetMap (OSM) to a PostgreSQL database. Moreover, this work shows how OSM data is transformed in two graphs and in several actual bus routes. The work is a combination of SQL commands and python programs to transform OSM data and combine it with external information to specific structures in a final database. This information was necessary for a second goal that was the approach and study of the Transit Network Design Problem (TNDP). Since OSM is a free collaborative tool, it is subject to manual errors in the map that produce mistaken graphs and routes. These errors are corrected daily because the area information is updated frequently. The obtained results confirm that this process could be automated in a one-click step. Finally, we tried other methods to upload OSM data and none of them got an exact graph except for osm2pgrouting.