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Re: ''Transit advocates urge Hochul to scrap LaGuardia AirTrain''

Posted by VictorM on Sat Sep 11 21:08:58 2021, in response to Re: ''Transit advocates urge Hochul to scrap LaGuardia AirTrain'', posted by Stephen Bauman on Sat Sep 11 19:50:07 2021.

Here's some information I downloaded some time ago from someone who seemed to know to know what they were talking about:

tracks J1 and J2 on the willy b from station 73+45 to station 77+35 (390 ft) is at 5.5% that's the steepest

track H2 on the manny b from station 287+35 to station 278+07 (928 ft) is at 5.4% grade.

steinway tubes from station 88+94 to station 101+99 (1305 ft) is at 4.5% grade

60th street tubes from station 102+12 to station 109=97 (785 ft) is at 4.37% grade
(this is also the steepest sustained grade in the system: 180 feet vertically over 4500 feet horizontally on the Queens bound track)


• Manhattan Bridge (Brooklyn and Manhattan approaches), Manhattan Bridge and Brighton/6th Avenue Lines

• Williamsburg Bridge: Manhattan approach, Jamaica Line

• Steinway Tunnel, Flushing Line

• 5th Avenue to Grand Central, Flushing Line

• S/O 36th St. to the 5th Ave. Cut Portal, West End Line (Open cut portion of West End Line)

• 38th St. Yard Viaduct Ramps West End Line (Open cut portion of West End Line)

• 60th St. Tunnel, Astoria and 11th St. Cut Lines (connection to Queens Blvd. Lines)

• South of Queensboro Plaza Upper Level to Astoria Line

• South of Broad St. Jamaica /Nassau Cut Line (to the Montague Street BMT Tunnel to Downtown Brooklyn)

• East N.Y. Yard Lead Jamaica Line

• North of Eastern Parkway/Broadway Junction Jamaica Line

• South of Chambers St. to North of Broadway-Nassau/Fulton St., 8th Avenue Line

• Grant Ave. to 80-Hudson St. Liberty Ave. Line

• North of South Ferry Loop, 7th Avenue Line (Westside IRT 1 train)

The longest continuous upgrade in the system is the 4.23% grade from the deepest part of the Queens bound 60th St tunnel under the East River to the upper level of Queensboro Plaza - 180 feet vertically (the height of an 18 story building) and 4400 feet horizontally.

The Queensboro Bridge is not aligned exactly parallel with the Manhattan street grid but angles slightly to the south heading towards Queens. However, the 60th street tunnel is aligned precisely with 60th street, so although the tunnel starts out alongside the bridge, by the time it reaches Queens it's about 130 feet north of the bridge. That's why there's that slight reverse curve which puts the tunnel back alongside the bridge at the switch to the 11th st cut just before the portal. There's also a third rail section gap at the switch.


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