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Marmaray tube crossing project, Istanbul
The Marmaray project in Istanbul is currently one of the largest transport projects in the world. Arup prepared the concept design of civil landworks including drainage, bridges, culverts, retaining walls, stations, trackworks, depot areas and roadworks.

From route, tunnels, viaducts and tracks to trains, stations and surrounding masterplans, our leading team of multidisciplinary experts work with clients to design transformative railways.

Our tunnelling and rail design experts ensure that schemes manage to align both climate and cost imperatives, finding ways to reduce the resources and materials used in construction and plan for their eventual renewal or replacement. We also bring our deep domain expertise of operational railways into design thinking for rail maintenance depots.

Our specialist rail architecture and design team approach every project with the passenger and ‘user’ experience at the heart of decision-making. This helps ensure stations are intuitive and a joy to use, complement their surroundings, and are efficient to maintain. Our global experience blending function with elegance in a cost-effective manner, such as our kit-of-parts design approach, ensures maintenance and replacements remain affordable over the rail system's full lifespan.

We also use a place-based approach to decision-making for rail projects, meaning that every choice relating to the route, station or design is evaluated for its potential to deliver wider economic prosperity, strengthen social connectivity, and regenerate urban and rural areas.

Find out more about our rail infrastructure design service