Benniworth, High Street Tunnel
High Street Tunnel, 510m (560 yds) long, is the shorter of the two tunnels on the Louth to Bardney line.
It passes under Caistor High Street (B1225) about 1 mile north of Benniworth village and lies between the former stations at Donington on Bain and South Willingham.
It was opened in September 1875. (The far end of the tunnel can just be seen in this photograph.)
Benniworth, High Street Tunnel, South Willingham