Stock Photo - Aug. 08, 1973 - Royal Railway ride: Lady Sarah Armstrong-Jones, and her mother, Princess Margaret (hat) are joined by zoological officials in their ride on the Whipsnade and Umfolozi Railway at Whipsnade Zoo Park today. Earlier, the Princess officially opened the railway, whose one-and-a-half mile circular track passes through a variety of animal paddocks. Princess Margaret's son, Lord Linley (not in picture) also accompanied them on the trip. (Credit Image: © Keystone Press Agency/Keystone USA via ZUMAPRESS.com)

Stock Photo: Aug. 08, 1973 - Royal Railway ride: Lady Sarah Armstrong-Jones, and her mother, Princess Margaret (hat) are joined by zoological officials in their ride on the.

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