Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 173,091 pages of information and 249,766 images on early companies, their products and the people who designed and built them.
Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,919 pages of information and 233,587 images on early companies, their products and the people who designed and built them.
Ponsbourne Tunnel on the Hertford Loop of the Great Northern Railway which at 2,648 yards is the longest tunnel in the eastern counties of England and runs between Cuffley and Bayford. The line was opened for goods traffic in 1918
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