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Design ID were appointed by FP McCann as Temporary Works Design Engineers to assist with the delivery of temporary works solutions to recasing defective brickwork within the historic Downhill and Castlerock Tunnels. Design ID designed a temporary steel and timber formwork solution that was securely fixed to the face of the tunnels during night-time possessions of the railway line. With railway safety in mind, safety clearances were maintained from the face of the Temporary Works to the railway line, to ensure that trains could remain operational throughout the repair process. Due to the historic nature of the brickwork, anchor testing was specified to observe the behaviour of masonry anchors utilised in the Temporary Works System, and ultimately reduce the risk to NI Railways Infrastructure.