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

Posted by Stephen Bauman on Sat Sep 11 20:12:31 2021, in response to Re: ''Transit advocates urge Hochul to scrap LaGuardia AirTrain'', posted by AlM on Sat Sep 11 18:13:54 2021.

There are plenty of Class 1 major freight railroads that have 2.2%*.

I used the 1% as a measurement to gauge the difficulty of clearing Amtrak's approach to the Hell Gate Bridge.

Even a 2.2% grade would gain 44 ft, over 2000 ft. The first 28 ft would be taken up by the gain in ground altitude. That would leave a net gain of 16 feet.

The clearance from the road to the bottom of the el is 12'6", as shown in Google's Streetview. There is no such clearance sign for the Hell Gate approach. This means the bottom of the structure clears the roadway by at least 15'. This further reduces the net gain to 13'6".

Take a look at the Amtrak structure. The altitude gain would have to clear the catenary. That's more than 20' above track level. There's also the trusswork below the tracks. That's much more than the height of the structure below track level on the Astoria Line.

Unfortunately, the initial engineering judgement was correct. Branching out near the Astoria Blv station isn't feasible because of Amtrak clearance problems.

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