In the days before he hanged himself, it was the clock that kept Michael Evans up at night. President of the public-private consortium, Moynihan Station Development Corp., Evans, 40, had already spent the better part of his professional career working on the conversion of the James A. Farley Post Office into the gleaming, light-filled $1.6 billion train hall at Penn Station, which opened Jan. 1. The Art Deco clock, which is suspended from the center of the 255,000-square-foot waiting area for Amtrak and Long Island Rail Road, was not part of the original renderings for the station. Evans, a handsome...