concre b.ncased in iron, they weigh 3 kilos and hang down just 25 centimeters above the roof of the trains. the rail company hopes they'll act as a deterrent. they're confident they'll stop the train surfers. it's a draconian measure, but they're desperate. >> we've tried everything. we've put oil on the train roofs, barbed wire. nothing worked. these are shock tactics. hopefully it will put people off. >> human rights activists describe the measure as tantamount to a death sentence. instead of investing in infrastructure and tackling the roots of the problem, they're preoccupied with the symptoms. but there is an alternative -- riding a bike. for the time being, it's not a popular mode of transport. but it's catching on. suki is a cyclist. three times a week, she cycles to her job as an accountant. 30 kilometers through rush hour traffic. >> the mopeds, the cars, the buses, they all cut you off and hoot at you, it's mad. cycling here is crazy but we have to do something. >> cycling as a protes