Originally Posted by
hailstorm
How in the world do they measure that? Large swathes of the Tokaido Line run in parallel with the Yokosuka Line, Keihin-Tohoku Line, even the Yamanote Line. If somebody is going from, say, Yokohama to Tokyo stations, you have no real way of knowing exactly what trains a person took to make that commute.
Good question. I have no idea.
If you asked me to do it, I would simply allot the revenue from each fare by the fastest routing available between the endpoints. This would over-count Tokaido to some extent, but you could perhaps use actual ridership numbers (which I believe they survey from time to time, by eyeballing I guess) to correct for this.