Europe's fragmented transport system, characterised by a diverse range of national regulations, necessitates innovative solutions. This densely populated, polycentric landscape presents a unique opportunity to address congestion, decarbonise transport, and connect regions. Recognising the transformative potential of hyperloop technology, Hyper4Rail aims to shape future mobility by converging European efforts towards a standardised hyperloop system. Led by the Hyperloop Development Program (HDP), Hyper4Rail brings together key European players – major hyperloop developers and Rail Europe members – to establish a common European hyperloop design concept at Technology Readiness Level (TRL) 2. This will be followed by demonstrating core subsystems at TRL 4 and defining pathways for industrialization and commercialisation, underpinned by a business case that identifies potentially viable use cases. Aligning with the EU's industrial strategy, Hyper4Rail fosters a technology-agnostic approach, leadership in standard setting, and the development of resilient passenger transport and supply chains. Hyper4Rail pursues a two-pronged approach: (1) technical harmonisation, industrialisation roadmaps, and applicability studies at TRL 2; and (2) design concept and validation of key subsystems at TRL 4. This directly addresses the goals of the Europe's Rail Joint Undertaking's Multiannual Work Programme (MAWP), particularly Flagship Area 7: "Innovation on new approaches for guided transport modes". As stated in the MAWP, this area seeks to explore "non-traditional and emerging flexible and/or high-speed guided transport systems," including "new types of railway-based transport, such as ultra-high-speed trains". Hyperloop technology aligns strongly with this vision, aiming to provide a socioeconomically efficient and long-term sustainable transport solution for citizens and businesses across Europe.