As Secretary of Transportation, he is credited as the driving force behind the $2 billion Tren Urbano (Urban Train), the Superaqueduct that has resolved metropolitan San Juan's water rationing problems, numerous road construction projects and the construction of the José Miguel Agrelot Coliseum in San Juan.
The project, called Tren Urbano, is the first design-build-operate system in the United States.
There is no service to Old San Juan, Santurce, the Luis Muñoz Marín International Airport (and many other parts of Guaynabo, Bayamón, and San Juan), and the Tren Urbano doesn't serve important suburbs like Cataño, Toa Baja, Toa Alta, Carolina, Trujillo Alto, Canóvanas and others, which helps to explain low ridership.