Passenger volume on the Dominican Republic's Santo Domingo subway line 1 has grown almost fourfold from 25,000 to 97,000 passengers daily since it opened in 2009, according to the public transport reorganization authority Opret.
The subway has served 42mn people, benefiting lower-income segments through providing transportation to the city's remote areas, according to a presidential release.
The boost in passenger volume represents a significant decrease in carbon emissions and other pollutants in the capital, said Opret's deputy director, Leonel Carrasco.
Line 1 runs over 14.5km with 16 stations, connecting Villa Mella in the north with La Feria in the south.
Opret has also invested US$35mn in excavation works for Santo Domingo's subway line 2, which will be 18.5km long and have 14 stations, stretching from San Luis in the east to Los Alcarrizos in the west.
The metro's second line is expected to cost an estimated US$900mn.