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Sharon Willett, a customer service assistant for East Coast Trains, talks about the day she managed to get the 15-year-old to safety.

She is one of over 5,000 rail staff who has been trained to spot people who may be at risk of taking their own lives.

In a special report, Life on the Line, Victoria Derbyshire looked at the hundreds of lives lost on Britain's rail networks. How authorities stop people taking their own lives and why bodies can go unidentified for years.

For details of organisations that offer advice and support go online to bbc.co.uk/actionline or call the 大象传媒 action line to hear recorded information on 0800 055055. Calls are free from most landlines. Some networks and mobile operators will charge for these calls.