The 2.1 mile (3.4km) Colne Valley Viaduct will be 100m longer than Dundee's Tay Bridge, which currently holds the title.
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HS2 will build more than 500 bridging structures – including over 50 major viaducts which will stretch for a combined total of 15km (9 miles) across valleys, rivers, roads and flood plains.
How deep is HS2? It will be bored using tunnel boring machines (TBMs) launched from the western portal, near Old Oak Common Station. The tunnel will be 7.2km (4.5 miles) long, and at its deepest point, will run 50m (160ft) below ground.