The HS2 rolling stock are trains for the under-construction High Speed 2 (HS2) high-speed rail line in the United Kingdom.

[8] The trains will be based on an evolution of the Zefiro V300 platform and able to run at the top operational speed of 360 km/h (225 mph) on the HS2 line.

[11] The trains are designed to be 'conventional compatible', capable of leaving the dedicated high-speed sections to continue onto existing lines,[12] and will be gauge-compatible with its planned operational routes where the loading gauge would be more restricted.

[8] The interior layout will be decided following a two and a half year design process involving HS2 Ltd, the Department for Transport and the West Coast Partnership.

The trains became the first in the world to achieve the BSI's PAS 2080 global accreditation for meeting environmental targets to reduce carbon emissions, such as by improving aerodynamics, using energy-efficient traction systems and lightweight, recycled content.