What was that documentary - Japanese train scheduling

[jbsegal]

In mid late October last year, I was in England, watching TV in my hotel room one night, and there was a documentary (on an Asian-focused cable or satellite channel, I believe) about a Japanese train scheduler and the challenges of his work... how a 5 second change could change the flow in and out of a station changing the efficiency of the loading and how long it took for the train to be filled and leave, and other such things.

I'd love to find this documentary and the guy's name. Anyone have any ideas?

Thanks in advance!