it's half past 4:00 in the morning at tokyo's otemachi subway station.his is an unlikely place to be riding a bicycle, but fotemachi is the largest subway station in tokyo. five different subway lines go through this station and there are 38 separate exits. the first chore each morning is to open all of the outside shutters. since it would take too long to walk to each one, etokyo train stations, otemachi and ginza,ime. are at the core of tokyo. there is a dramatic difference between the daytime and nighttime population in this area. according to the 2000 census, over one million people work here, but only 40,000 people live here. that means for every 26 people here during the day, only one is here during the evening, and those other 25 are commuting in on public transit. in tokyo, the government and private industry have worked very, very hard to develop a very efficient rail transportation system. and there's actually more use of public transit in tokyo, i believe, per year than in the entire use of public transportation in the united states. so public