Some NYC subway lines at capacity

Some of New York City's busiest subway lines are at capacity, with no more room on the tracks to add trains to alleviate swelling crowds of riders, officials said.

New York City Transit presented an analysis of data showing how often trains run late, how crowded they are and whether more trains could be added to ease the problems.

Howard Roberts, the president of New York City Transit, told members of the Metropolitan Transportation Authority's board that the assessment's findings are "scary."

"This is scary in the sense that right now, on a lot of these lines, we're several years and a big capital construction project away from being able to provide what I would consider adequate service," Roberts said.