The administrations of mayors Andrés Pastrana (1988–1990) and Jaime Castro (1992–1994), in addition to the first one of Antanas Mockus (1995–1997), formulated proposals to solve the problem of public transport, with limited results. It was during the mayoralty of the latter when there was an insistent talk about the possibility of establishing a mass transportation system that would help remedy the problem of mobility in Bogotá.