Most of the city’s 2013 mayoral candidates came together to broach public-transportation issues in back-to-back forums at Baruch College in Manhattan on Wednesday. Anthony Weiner was there, looking very determined to come across as thoughtful and focused rather than bored (as the press corps has branded him at previous debates). But it was John Catsimatidis, the grocery-store baron and long-shot Republican hopeful, who made the biggest splash of the morning when he called for building a monorail alongside the Long Island Expressway. “Not subway, ABOVE-way,” he said, dismissing the possibility of expanding the existing underground rail system as a pipe...