The presented work in work package 6 is a part of the European funded research project Sustainable Bridges. The objectives of this project are to: Increase the transport capacity of existing bridges by allowing axle loads up to 33 tons for freight traffic with moderate speeds or for speeds up to 350 km/hour for passenger traffic with low axle loads. Increase the mean residual service lives of existing bridges with up to 25 %. The project contains 9 work packages, where WP6 deals with new and innovative repair and strengthening methods for railway bridges. All work-packages are correlated. However in this paper the work carried out in work package 6 and how development of environmental friendly and non disturbing repair and strengthening methods may enhance management, strengthening and repair systems is presented.