Trains that go 180 mph have a way of draining your pocketbook. If you don't work near a station, or live near one (or, worse, both) you face commuting hassles. You may have to take a train that averages 30 mph as it makes all stops to get to the 180 mph express one.
It actually works well enough in japan: 15-20 minutes on a local to get to the Shinkansen station, then an hour on that, then another 15-20 minutes to get where you are going. Not really in daily commute range, but definitely viable weekly.
