The learnings from this project could inform and influence future developments in hydrogen rail technology, both within the UK and internationally. The "shovel-ready" nature of the project, as emphasized by Alstom, highlights its potential for rapid deployment and immediate impact on the UK's emission reduction targets. Conclusions The Alstom and Eversholt Rail collaboration on the Breeze hydrogen train program represents a pivotal moment in the UK's journey towards a sustainable railway system. The project successfully marries technological innovation with economic and environmental benefits. By retrofitting existing Class 321 EMUs with hydrogen fuel cells, the initiative provides a cost-effective and timely solution for decarbonizing non-electrified lines. The creation of over 200 jobs at Alstom's Widnes facility demonstrates the considerable economic impact, while the zero-emission operation of the resulting Class 600 HMUs directly addresses environmental concerns.