The Glenfield Tunnel is a 1.5-mile (2.4 km) long tunnel that forms part of the West Coast Main Line railway in Leicestershire, England. The tunnel was constructed in the 19th century and features a distinctive "fox" shape, with a narrow, curved profile that allows trains to pass through it at high speeds. The tunnel's unique design was intended to reduce air resistance and noise pollution, and it has become a notable landmark in the region.