A returning travel rush by rail was witnessed on Wednesday in the Yangtze River Delta region, last day of the five-day Labor Day holiday. Some 3.27 million railway passengers were recorded by railway stations in the region, soaring 145.5 percent from the same day last year, China Railway Shanghai Group said. Between April 29 and Wednesday, more than 21.96 million passengers took trains in the region, up 145 percent compared with the same period last year.