The latest addition to JR East (East Japan Railway Company) is the Hayabusa (Peregrine Falcon), a Shinkansen service from Tokyo to Shin-Aomori in the far north of Honshu. The new train, which started service on March 5th, has a top speed of 300 kph (186 mph) and even with stops covers the 675 km in 3 hours 10 minutes.
Here's an ad for the first class service:
Even the regular cars have 5 across seating and are upgraded with a seat pitch of 1,040 cm (41 inches) for plenty of leg room, adjustable head rests, and power outlets at every row for your computer or mobile phone charger.
The newest Shinkansen trains produce a fraction of the greenhouse gasses of aircraft or other forms of transportation while being as fast and even more convenient and comfortable.
The Hayabusa is the world's most energy efficient train, being more than 10% more efficient that previous Shinkansen models. JR East has a target to reduce the company's CO2 emissions by 32% by 2018 and by 50% by 2031. Power to the train comes from a mix of sources including JR East's own hydro-electric plant, their own gas fired thermal plant, and from other companies that use wind, solar, coal, nuclear, and oil.
*post updated 2011/03/10