The Nanjing Yangtze River Bridge, seen here on Thursday, August 2, 2018, is undergoing an extensive overhaul that has so far lasted 21 months. The double-decked road-rail truss bridge in Jiangsu's provincial capital first opened to the public 50 years ago. [Photo: IC]

The Nanjing Yangtze River Bridge, seen here on Thursday, August 2, 2018, is undergoing an extensive overhaul that has so far lasted 21 months. The double-decked road-rail truss bridge in Jiangsu's provincial capital first opened to the public 50 years ago. [Photo: IC]

The Nanjing Yangtze River Bridge, seen here on Thursday, August 2, 2018, is undergoing an extensive overhaul that has so far lasted 21 months. The double-decked road-rail truss bridge in Jiangsu's provincial capital first opened to the public 50 years ago. [Photo: IC]