This leaflet provides railway infrastructure owners, maintenance managers, bridge inspectors and consulting engineers with guidance on the inspection, assessment and maintenance of masonry arch bridges. This leaflet was prepared by the UIC "Masonry Arch Bridges" working-group under the project I/03/U/285 "Improving assessment, optimisation of maintenance and development of database for masonry arch bridges" between 2004 and 2007. Further information and guidance is available in background documents and reports prepared by the members of the working group. These documents are available separately from UIC and are listed in the References. The leaflet covers the following areas: structure and behaviour of masonry arch bridges, inspection, monitoring and condition appraisal of masonry arch bridges, assessment of masonry arch bridges, maintenance and repair of masonry arch bridges.