By RICH CALDER
A long-shelved plan to restore trolley service in Brooklyn is back on track.
The city has hired a transportation consultant to study running a mile-long trolley or light rail line from the Red Hook waterfront to Atlantic Avenue at the southern edge of Brooklyn Bridge Park.
The URS study could also look at extending the route another half-mile east along Atlantic Avenue to the transit hub at Borough Hall, sources said.
The city Transportation Dept. is finally tapping into a $295,000 federal grant Rep. Nydia Velazquez (D-Brooklyn) secured for the five-month study in 2005.