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This is pretty neat (even if not realtime :))

I'd really love to know where the data is coming from.

I played[1] with a similar idea a few months ago creating a simple visualization just for fun that is more like a timelapse of the "veins of tokyo" and was curious about the distribution of trains during the day. In my case, I just scraped the tokyo metro site's timetables, but it's quite a bit of work to fit the data (identify the trains with rapid/semi-rapid trains that skip stations, etc) - it's still not easy to know when a train would be waiting at a station, the best I could have done is guess from the average time between stations, which also does vary throughout the day. Eventually only a few lines made it in.

[1] http://zaki.asia/metro




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