Trains on the Brooklyn Bridge?

"'People took trains across the bridge,' says former Transportation Commissioner Sam Schwartz. 'At one point, there were four tracks across the bridge. More than 400,000 people a day in those early decades used the Brooklyn Bridge every single day.'"

"'The Brooklyn Bridge walkway is getting so popular that we may have to begin to think, How do we accommodate all the pedestrians? Should we put the roads on a diet? Should we introduce some kind of transit service? Probably not a bus service, but maybe it will be a light rail service going across the bridge,' says Schwartz. 'So in the next 75 years ‘til its bicentennial, I think the bridge probably will go back to a more transit-oriented bridge.'"