Starting at a new purpose-built Luton Parkway station – which connects to the Network Rail station – the Dart will run on a 350m long viaduct, before transitioning to a 72m long, 1,000t steel truss bridge with composite deck that runs over a live dual carriageway. The Dart then weaves its way past Luton Airport’s landing lights, through a 600m long cut and fill section before entering a 500m long concrete base trough section. It then heads underground into a 350m cut and cover tunnel, which dips beneath the airport’s taxiway and into a new Central Terminal station, 20m beneath the airport’s current “drop-off” area.