A man was killed and a woman was injured when they were struck by an NJ Transit train Thursday in Union County, according to the transit agency. The two people were hit by Gladstone Branch Train No. 419 around 1:40 p.m. near the Valley Avenue Bridge in Berkeley Heights as the train traveled from Hoboken to Gladstone, NJ Transit said in a statement. “The extent of the female pedestrian’s injuries are unknown at this time,” the agency’s statement said. Service on the Gladstone Branch was suspended near the Berkeley Heights Station as of around 3 p.m., according to NJ Transit. The agency’s police…