 The March 2010 engineering study conducted by Arup for HS2 Ltd costed a "classic speed" GC loading gauge direct HS2–HS1 rail link at £458 million (single track) or £812 million (double track).This link would go from Old Oak Common feeding into the High Speed 1 network at St Pancras, via tunnel and the North London Line with a high-level junction north of St Pancras station for non-stopping services.The study found that double-track high-speed connection on the same route would cost £3.6bn (4.4 times greater than for classic speed).