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Orphanage Road bridge

MPB Structures were appointed to deliver the full replacement of a key bridge carrying four tracks of the West Coast Main Line over a local access road, an operation demanding precision, planning, and absolute reliability. Our scope included the design and construction of piled retaining walls, followed by the off line fabrication of a 450 tonne replacement bridge deck, engineered for rapid installation. During a tightly controlled possession, the new deck was transported and positioned using SPMTs, enabling a seamless changeover with minimal disruption to rail operations.

The works also included full track removal and reinstatement, temporary support and protection of critical signalling infrastructure, and the safe demolition of the existing structure. This project showcased MPB’s ability to deliver complex, high risk rail infrastructure upgrades with speed, accuracy, and complete confidence.

CHALLENGES / SUCCESSES

A primary challenge was the off line construction of the 450 tonne replacement bridge deck, which demanded strict dimensional control to ensure compatibility with existing track geometry and structural interfaces. The subsequent installation using Self Propelled Modular Transporters (SPMTs) introduced additional technical risk, requiring accurate load distribution, controlled manoeuvring, and continuous monitoring to maintain stability during positioning.
The design and construction of piled retaining walls adjacent to operational railway assets required careful assessment of ground movements, vibration limits, and potential impacts on track alignment.
Track removal and reinstatement had to be completed within the possession window, with precise tolerances for ballast, rail alignment, and geometry to ensure safe hand back to Network Rail.

Collectively, these achievements showcase MPB’s skill in delivering demanding rail infrastructure works with expert management, assured execution, and dependable performance.

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