A $5 million federal grant will pay for building a new intermodal ramp for truck and train traffic at the Port of Tucson, a shipping facility on the city's southeast side.

Port owner Alan Levine says the Transportation Department grant will be used for construction of a ramp serving Union's main line, allowing cargo containers to be unloaded in Tucson or loaded onto trucks or other trains.

Congressman Ron Barber says the intermodal ramp will allow the port facility to handle more international cargo through transloading of international shipping containers.

Barber says the increased capacity will increase Arizona's competitiveness in overseas markets.

According to Barber's office, that makes it possible for U.S. exporters to access Asian markets by filling westbound containers that would otherwise return to Asia empty.