Transit Reform Office Assistant director Leonel Carrasco said the subway’s electrical system is safe but not infallible, calling today’s incident "bothersome" for passengers, affirming that in no way endangers passengers lives.

He apologized to the straphangers for the mishap and said they should get used to those types of faults occurring sporadically.

An electrical glitch also halted service on September 25

Another article from USA,

(AP) — SANTO DOMINGO, Dominican Republic - The Dominican Republic's first subway line has broken down several times since its January debut, and a transportation official said Wednesday that riders should get used to such problems.

Breakdowns could occur several times a day, but they are not a danger to people, Transit Office deputy director Leonel Carrasco told reporters.

Dozens of passengers were trapped for almost half an hour on Wednesday because the train overheated, he said. Local media reported that one woman fainted as the train car grew stuffy.

President Leonel Fernandez was criticized for spending more than $710 million to build the subway line even as a quarter of the population lives in poverty.

It is the third time the train malfunctions since its debut in January. It serves 16 stations in its 9-mile (14-kilometer), north-to-south run through the capital of Santo Domingo.

Fernandez is still seeking developers to build an additional subway line, as well as an 80-mile (130-kilometer) train line that would connect the cities of Santiago and Haina.