Design-Build for Replacement of the Coney Island Yard Retaining Wall & St Marks Elevated Viaduct

St. Marks Elevated Viaduct:

This Design-Build Contract encompassed significant infrastructure improvements in the Borough of Brooklyn, New York, including the installation of a new RETAINING wall system at the Coney Island Yard complex and the replacement of the St. Marks VIADUCT.

St. Marks viaduct involved the design and construction of a new open deck, single track, multi-span, steel girder elevated viaduct structure, along with signal work and the replacement of track, track ties, and related equipment. The scope also included reconfiguring and retrofitting existing abutments (the use of the word abutments here is OK as there was an abutment connected to the viaduct) and earth retaining structures, removing and reinstalling track and third rail components, and restoring deteriorated concrete. Additional installations included new contact rail components and negative running rail, the installation of new signal and battery cables, and modifications to signal controls at Dekalb Avenue and Park Place. The Franklin Avenue Shuttle Automatic Dispatching System was also modified as part of this project.

Coney Island Yard Retaining Wall:

Coney Island Yard involved designing and constructing a new retaining wall system on the track-side fascia of the existing crib wall, including the removal of temporary wooden structural elements and deteriorated concrete. Structural components were reinforced and replaced. New bridge clips, wire baskets, and contact rail appurtenances were installed, and existing light fixtures along with associated conduits were replaced. The project also included maintaining and protecting existing signal equipment and traction power cables, as well as performing track alignment testing.

The project aimed to enhance the structural integrity and functionality of the St. Marks viaduct and improve the safety and reliability of the Coney Island Yard complex. The upgraded and modernized signal and power systems will contribute to the long-term stability and efficiency of critical infrastructure in Brooklyn, significantly improving the transit system.