HS2 has revealed that its engineers have installed the last roof segment on the Burton Green tunnel in the West Midlands, completing the structure of the tunnel.
A major step forward in the construction of a tunnel being built near Chipping Warden took place when the last of the tunnel segments was lifted into place.
HS2 is assembling the west deck of the M6 South viaduct, which high-speed trains will travel across on their way to Birmingham.