“Where there was darkness on the morning of Sept. 11, 2001, the architect Santiago Calatrava would bring a flood of light in the form of a winged railway station, draped in glass, suffused with natural illumination and, on occasion, open to the clear skies above. Mr. Calatrava’s design for the permanent World Trade Center PATH terminal, which was unveiled yesterday, is a soaring, sculptural, steel-and-glass shell covering a cathedral-like concourse.”