Northern Line Underground Train in a tunnel
Northern Line Underground train
A Northern Line train heading through a tunnel lights up its surroundings.
Brunel’s shield method of tunnelling was further enhanced by an engineer called Peter Barlow. He added the idea that as the shield was pushed forward workers filled the space behind with segments of steel joined together to form the circular walls of the tunnel.
Image reference LDNLDNNORLINE1
All photographs copyright artofthestate
Northern Line Train