Seven Oaks Rail Refurbishing a ventilation shaft The rail line at Seven Oaks runs through a Victorian tunnel constructed in the 1830s. To facilitate tunnel construction and aid ventilation for the steam locomotives several shafts were sunk through the hill side, each up to 120 m deep with a brick lining. Over the years this brickwork has become degraded. The contractor Bam Nuttals have been given the task of refurbishing the ventilation sha

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