At the age of 12 Sir John Wilson was blinded in a school laboratory accident, and has dedicated his working life to the prevention and treatment of disability. Thirty years ago the Prime Minister of India, Pandit Nehru , told him that India's greatest asset was its railway system, and many years later Sir John has persuaded the Indian government to provide a train fitted out as a mobile hospital, travelling from village to village throughout India. Bismilia is 7. Since contracting polio as a baby she has never been able to stand, gettingaround her village by crawling in the dirt. Then her mother heard about the " magic train", the Lifeline Express. QED follows the train into Bismilla's village to treat those suffering from polio, blindness and deafness. The film also covers Sir John's first visit to the train, and the first steps Bismilla takes after her operation. Narrator Sue Lawley. Producer Fiona Holmes