"The plan adds an infill station for a transfer to the LIRR and extends the line in a slightly roundabout way to connect to an infill Northeast Corridor station before veering to the airport."
"Subway lines should be radial or circumferential and not mixed, and this is a mix - IBX is circumferential, connecting stations at a fairly consistent distance from Manhattan."
"Such lines always underperform, because they fail at both the function of a radial line, namely connecting outlying areas to city center, and those of a circumferential."
The proposal suggests extending the Interborough Express (IBX) to LaGuardia Airport with an infill station for LIRR transfers. This design aims to create a hub by connecting various lines. However, it fails because subway lines should be either radial or circumferential. The IBX is circumferential, and adding a radial extension to the airport undermines its purpose, leading to underperformance in connecting outlying areas to the city center and improving interconnections between lines.
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