People push their bicycles across a railway track during rush hour in Shanghai in this 1991 file photo. As China battles an economic slowdown that could test Communist Party control, its leaders are celebrating events 30 years old to reaffirm the reform policies that took the nation from Mao jackets to business suits. REUTERS/China Daily/Wang Wenlan/Files (CHINA) B/W ONLY. CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA.