Conceptual designs for Thameslink—2000 structures

This paper relates to three separate feasibility studies for flyover constructions carried out during the early 1990s for the Thameslink–2000 railway project. Existing Thameslink lines have to pass through many congested parts of the network which greatly slow down this route, particularly in the south-east London area. Essentially three sections of the route, namely the South Bermondsey, New Cross Gate and Borough High Street locations were identified to be specifically problematic and where special constructions are likely to be necessary. The principal objective of the improvements, therefore, is to provide two tracks (one UP and one DOWN) dedicated to this route and to minimise any adverse interaction of these and other important services in this area of the network. The paper describes the severe constraints relating to the variety of existing constructions, railway services and of ‘possessions’ which greatly limit possibilities for the required constructions. The paper, however, shows how it is still possible to evolve sound engineering solutions and, in some cases, multiple options for the project requirements.