New York can’t rebound unless it coaxes commuters back. On an average fall day in 2019, of the nearly 3.9 million people who descended on Manhattan below 60th Street to work, shop or run errands, 76 percent came in via some sort of transit. That figure included 2.2 million subway riders, nearly 350,000 commuter-rail passengers and nearly 300,000 bus riders. With subway ridership at 30 percent of normal and railroad ridership at about 20-25 percent of normal, the question is how to get at least some of them back.