I was curious about the "largest train station in the world" claim. I figured there would be bigger ones by now in India, say, or China. Sure enough, there are different metrics by which different stations can claim to be the largest. Nagoya Station in Japan, for instance, is the largest in floor area. Shinjuku Station, also in Japan, is the busiest by daily traffic. The Gare Du Nord in Paris is the second busiest by this metric. Apparently Grand Central is the biggest in platform capacity.

Anyway, back to the point.