Santo Domingo (2.2 mill. inh.) is the capital of the Dominican Republic in the Caribbean Sea.

The Metro is operated with three-car trains of Alstom's Metropolis 9000 (identical to those in service on the Barcelona Metro).
The originally planned metro line had an extension of 10 km, with 11 stations, running below Av. Maximo Gomez mainly in a north-south direction, all underground. The project was then modified due to objections made by the city, and the line eventually became 14.5 km with 16 stations. Instead of using the names of intersecting road, the stations were named after national personalities.

After construction had started in 2005, trial service was offered from 22 Dec 2008 to 06 Jan 2009, before an official inauguration took place on 29 Jan 2009