Julia Bradbury takes a series of walks following the old tracks of Britain's lost rail empire. In this episode, Julia explores railway history in the backstreets of Weymouth. Tracing the route of a short Dorset line that once ran south from the town and across Chesil Beach and Portland, she learns about the history of Portland Harbour, and the stone that is the isle's most famous export. (From the UK) (Documentary Series) (Part 5 of 6) G CC