The Glenfield end of the tunnel can still be seen .
Just before reaching the station the line passed through Glenfield Tunnel , which was built by Robert Stephenson and was , at 1 mile 36 yards , the world 's longest railway tunnel at the time .
The railway tunnel end of the tunnel can still be seen .
Just before reaching the station the line passed through Glenfield Tunnel , which was built by Robert Stephenson and was , at 1 mile 36 yards , the world 's longest railway tunnel at the time .