Passenger Network Ridership Model Through a BRT System, the case of TransMilenio in Bogotá

We present a ridership model of individual trajectories of users within a public transport network for which there are several different routes between origin and destiny and for which the automatic fare collection data does not include information about the exit station; only card identification and time of entry into the system. This model is implemented in the case of the Troncal component of TransMilenio, the BRT system that is the backbone of public transport in Bogot\'a. The granularity of the data allows to identify the occupation of every bus within the system at any particular day. As a validation, we compare the average bus occupation of two particular days, 17 of May of 2020 and the 1 of December of 2020.