Commentary With all the terrible things happening in the world right now, it might seem beside the point to discuss urban light rail. But public policy, like golf, is never so bad it can’t get worse. And a tiny throwaway line in a story out of Montreal, a cloud no bigger than a man’s hand, portends a terrible deluge if we do not act fast. Again, you might say Montreal is one of those fortunate cities that doesn’t know what real trouble is, so people there fixate on trivia like expensive French tutoring bouncing off the president of Air Canada. Or the light rail Réseau express métropolitain that was, yet again, oversold. In the March 26 National Post André Pratte discusses that problem, right down to glistening images of clean, sleek, 23rd-century infrastructure giving way to big ugly support pillars and “catenary” to bring it power. To which one might …