Soon after dangerous stunts on Mumbai trains were exposed, railway authorities have swung into action.After Headlines Today featured the stunts video, the railways have gone on a drive in Mumbai to catch the offenders. During the last two days, the Government Railway Police (GRP) has arrested nearly 70 youth, who carry out death-defying stunts on trains.A 13-year-old boy, Zahid Ansari, who appeared on a video doing what is popularly called 'train surfing', even landed in hospital while trying to imitate many others and is battling for his life.Headlines Today had shown how young Mumbaikars hang out of fast-moving trains and move about dangerously hitting poles along the railway lines. Many of them confessed to Headlines Today that they indulged in the dangerous act just to impress women.In a desperate attempt to garner their 15 seconds of fame in cyberspace, some youths wish to join a select group of desperadoes from around the world who call themselves 'train surfers'.Train surfing is not a sport but an act of putting life in grave danger by some thrill-seeking youngsters. On the net, this is generally referred to as an extreme sports, which involves riding outside speeding trains.Mostly young male adults indulge in this deadly sport, film them, and upload them immediately on popular video uploading sites.Recently, a 13-year-old boy lost his arm in South Africa, when he touched a high-voltage cable, while running atop a moving train.In October last year, 21-year-old Nilesh Jagtap from Mumbai tried to outrun an oncoming local train, in a bid to do an Aamir Khan act, while copying his train-chasing stunt from 1998 film Ghulaam. He died in the act.Train surfing has been officially declared illegal and banned in many countries. In India, while there is no specific law against it, it still is an illegal act.