Over the decades it has been discussed numerous times whether to extend the line out to the limits of the city proper. The last of these proposals came forward in 2002 which would have seen an additional two stations added to the line. However, this was later abandoned since the line was already at full capacity after the opening of Congreso de Tucumán station. In June 2015 the Metrobus Cabildo line opened, connecting Line D from its terminus at Congreso de Tucumán to Vicente López district in Greater Buenos Aires, some kilometres away from the city limits, essentially making the extension of Line D redundant. Line D is the only line in the network which will not be extended as part of the most recent expansion plan.