Until May 2013 , it was considered to be the earliest rail - related tunnel in the world .
Until May 2013 , it was is now believed to be pre-dated by Fritchley Tunnel on the Butterley Gangroad at Fritchley , also in Derbyshire .
Until May 2013 , it was considered to be the earliest rail - related tunnel in the world , but is now believed to be pre-dated by Fritchley Tunnel on the Butterley Gangroad at Fritchley , also in Derbyshire .