I used to do High End renovations on Central Park in Manhattan and we would ride the train to Connecticut every day from Grand Central Station. One evening after a few drinks at the bar we thought we'd see how high up in the station we could get before they threw us out. Well we made it all the way up to the attic above the arched ceiling. Same type of trusses and support system for the ceiling. Really cool stuff. Another cool thing was the walkways at each level that you can see running across the huge glass windows at either end of the station. The walk ways were all 2" glass under your feet. Really weird feeling to see that far down below and know you are walking on glass. I stomped on it a few times and nothing happened aside from my buddies pissing themselves and running for the stairs.