Railways Minister Suresh Prabhu on Tuesday unveiled bar codes for unreserved tickets to prevent fraud and a rail auto hub near Chennai."This new bar coding system on unreserved rail tickets will stop possible fraudulent activities which will help in more railways revenue," said Prabhu through a video link at Rail Bhavan.Bar coding facility on unreserved tickets is available at nominated counters in New Delhi and Nizamuddin railway stations.Prabhu also inaugurated the rail auto hub at Walajabad railway station, near Chennai, of the Southern Railway as announced in his rail budget for 2016-17."Chennai is our initial step and Indian Railways is further working on how to get more auto transportation onto the railway track," said Prabhu.Spread over 5,000 square metres, the hub has a capacity to load 300 four-wheelers and is located near the Nissan, Hyundai, Ford and Daimler Chrysler auto plants.