Ampthill Tunnel
Encyclopedia
Ampthill tunnel is a railway tunnel
Tunnel
A tunnel is an underground passageway, completely enclosed except for openings for egress, commonly at each end.A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers...

 on the London Midland region between Bedford and Flitwick
Flitwick railway station
Flitwick railway station is in the centre of Flitwick, in Bedfordshire, England. The station is situated on the Midland Main Line. The station is managed by First Capital Connect, and is served by the Thameslink line service...

. There are two bores; one carrying a pair of fast lines, the other a pair of slow lines. Both are 715 yards long.
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