On this day in 1871, 155 years ago, the foundation stone of the first Tay Rail Bridge was laid, triggering a chain of events that would result in its catastrophic collapse eight years later.
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Portals of longer tunnels
Portals of longer tunnels
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Discarded for a younger model next door, Colwall Old Tunnel is one of the country's longest disused bores at 1,567 yards.