The existing signalling system, which dates from the network’s construction in the 1970s and 80s, has become “increasingly difficult to maintain” due to the difficulty in finding parts and those with the engineering skills to carry out repairs, Nexus has previously said.
Ms Massarella said: “We are working with analogue technology in a digital era.
“Without signals we can’t run the trains.”
The announcement follows Nexus submitting a business case to the DfT last year which sought about £400m for a signalling system upgrade.
It is unclear how much money the DfT has so far committed to project.
The government did however confirm that this money was separate to the £1.85bn slated for transport infrastructure which the government promised to the region earlier this year.
A large amount of those funds will pay for the expansion of the Metro to Washington.
It is also unclear when these signalling upgrade works will begin.
The DfT and the North East Combined Authority have been approached for comment.
