59K views · 1.2K reactions |  A brand new signalling system will replace ageing equipment dating back to the 1970s on the Northern City Line.  Some of the old equipment even ran on compressed air. The change will reduce delays and create a more reliable service for you. ✅  https://www.networkrailmediacentre.co.uk/news/new-signalling-to-give-passengers-better-journeys-on-great-northerns-route-to-city-of-london | Network Rail | Facebook