NR/GN/CIV/025 Guidance Note – The Structural Assessment of Underbridges

Available from NR Portal, CIS.

The purpose of this document is to provide recommendations for applicable standards and analytical methods which may be used to determine the load carrying capacity of existing Network Rail underbridges. The load carrying capacity is determined in the context of the performance requirements of an underbridge. The requirements are that the bridge meets safety and serviceability criteria whilst regularly carrying rail traffic up to a level of traffic load and speed in accordance with operational system requirements.