Construction of the Colne Valley Viaduct which will stretch for 3.4 km and carry high-speed trains around 10 metres above a series of lakes and waterways outside northwest London. Photo: PA
Construction of the Colne Valley Viaduct which will stretch for 3.4 km and carry high-speed trains around 10 metres above a series of lakes and waterways outside northwest London. Photo: PA

HS2 rail link 'may never reach London'