This column is based on eyewitness accounts, trial transcripts, testimony, and information from the New York City Fire Dept. and the New York Historical Society. It is the harrowingly small amount of sidewalk that may hit you when you stand in front of the building that housed the Triangle Shirtwaist Factory, where 100 years ago this March 25, 146 garment workers -- 129 women, 17 men -- perished in a murderous fire that ranks as one of the worst this nation has ever known.