... See this Google map of the metropolitan area or download the incredibly detailed city map (pdf format) from the Montreal transit site ...It's a richly detailed 4.4 MB pure vector PDF.
I tried viewing it in OS X Preview.app. Not such a good idea. Preview pegged my MacBook at 98% CPU and a GB or so of memory.
This is the first time OS X Preview has disappointed me. I hadn't realized it was such a light duty application. I'm contemplating installing Adobe's product, something I try very hard to avoid given Adobe's astounding record of installer dysfunction.