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Prior to the study conducted by the USCG and the NYSDOT, options to ameliorate the issue included a new rail tunnel under the Hudson River, the rehabilitation of the Poughkeepsie Bridge, the use of the North River Tunnels, a cross-harbor rail ferry, the use of low-profile piggyback equipment and the use of the Harlem, New Haven, and Hudson Divisions through the removal of clearance restrictions.
Vertical clearance: The minimum vertical clearance under overhead structures, such as bridges, is 16 feet (4.9 m), including both paved shoulders and an allowance for extra layers of pavement. Through urban areas, at least one routing is to have 16-foot (4.9 m) clearances, but others may have a lesser clearance of 14 feet (4.3 m).
The restoration in 2006 of freight rail service to Staten Island via the Arthur Kill Vertical Lift Bridge at a cost of $72 million. The ExpressRail System, a $600 million investment in improved intermodal rail facilities at the container terminals on the west side of the Upper New York Bay and Newark Bay in New Jersey, and on Staten Island. [5]
CSX lists three clearance heights above top of rail for double stack service: [8] Doublestack 1 — 18 ft 2 in (5.54 m) [8] Doublestack 2 — 19 ft 2 in (5.84 m) [8] Doublestack 3 — 20 ft 2 in (6.15 m) [8] Doublestack 4 — 20 ft 3 in (6.17 m) [9] The last 2 clearances offer the most flexibility, allowing two high cube containers to be stacked.
In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.
Each tube provides a 21.5-foot-wide (6.6 m) roadway with two lanes and 13 feet (4.0 m) of vertical clearance. [2] Most vehicles carrying hazmats are not allowed in the tunnel, and trucks cannot use the center tube. There is a width limit of 8 feet 6 inches (2.59 m) for vehicles entering the tunnel. [3]
The code also defines the clearance that is shorter than the physical clearance to account for sag curves, bridge deflection and expected settlements with a recommendation of minimum clearance of 5 metres (16 ft 5 in). [2] In UK, the "standard minimum clearance" for structures over public highways is 16 feet 6 inches (5.03 m). [3]
This page was last edited on 29 August 2023, at 00:35 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...