Portal North Bridge's third and final arch is now in place. It's a major milestone in the project.
The final arch over the new Portal North Bridge​ in New Jersey is in place. It's a major milestone in a crucial piece of rail ...
PBS3mon
Arch Bridge
Arch bridges are one of the oldest types of bridges and have great natural strength. Instead of pushing straight down, the weight of an arch bridge is carried outward along the curve of the arch ...