Site preparation is underway on the third and final section of the High Line. Construction crews are working through the cold winter temperatures to clean and paint the High Line’s railing, steel beams, girders, and columns.
Follow us after the jump for photos and more details.
When you visit the High Line this month, you can’t miss the construction happening all around the park’s northern terminus.
Cranes are erecting the steel framework for a new residential building  at the southwest corner of West 30th Street and 10th Avenue. Across the street, bulldozers are excavating and preparing for the first tower in Hudson Yards . On the High Line itself, you see a portion of the elevated railway wrapped with grey canvas, creating a containment tent. Inside the tent, crews are removing dirt and graffiti from the High Line’s steel through a process called sandblasting.
In the photo at right, you see a member of the crew removing concrete from a High Line column, which was previously filled as part of a building project below the elevated railway. The construction team must remove the leftover concrete encasements and residue on columns and beams, so that these steel surfaces can be sandblasted as well.
After sandblasting the steel, the team begins applying a three-coat painting system to seal the structure, beginning with a zinc primer coat that must be applied shortly after sandblasting to prevent the raw steel from rusting. Once the primer coats are applied, crews add the topcoat – the iconic “Greenblack” color that was used to paint the High Line’s steel frame and railings between Gansevoort and West 30th Streets.
The steel rehabilitation process proceeds in phases, with all of the work taking place within the containment tent. Once the workers finish painting the topcoat, the tent will be dismantled and reinstalled to the west, so that the sandblasting process can begin on the next section of the elevated railway.
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