The 16.7 km elevated viaduct on one of the lines of the Riyadh Metro in Saudi Arabia is being constructed, with the help of UK-based Dorman Long Technology. ... The precast box girders on this project ...

The Riyadh Metro is a project that involves the digging of some 51km of tunnel, and the progress of the tunnel-boring machines (TBMs) working on the project has been frequently celebrated. However, ...

First TBM starts drilling on Riyadh Metro Green Line. The first of two FAST Consortium tunnel-boring machines ... installing precast concrete segments as rings which form the tunnel lining as it moves ...