190511-The-ALFA-X-version-of-the-Shinkansen
The ALFA-X version of the Shinkansen. Image Credit: Social media

Tokyo: Japan has started testing its fastest-ever bullet train - capable of reaching 400 kilometers per hour.

The ALFA-X version of the Shinkansen train began three years' worth of test runs on Friday, the CNN reported.

Once it enters operation, sometime around 2030, it will run at speeds of up to 360 km/h, making it the world's fastest bullet train.

It will also outpace China's Fuxing train, which runs 10km/h slower despite being designed with the same top speed capabilities as the ALFA-X.

The model's design features 10 cars and a long pointed nose.

It'll be tested on the line between the cities of Sendai and Aomori, which are about 280 kilometres apart. Tests will take place after midnight, when the line is quiet, twice a week.

The ALFA-X marks a new stage of growth for the Shinkansen, pushing the world-renowned high speed rail service even faster towards the future.

Its testing debut comes as Japan's new high-speed Shinkansen N700S continues tests that began just over a year ago.

10cars

capacity of the ALFA-X version of the Shinkansen train.

That model will enter operation in 2020, but its maximum speeds of 300km/h - the same as other N700 series trains - will be easily surpassed by the ALFA-X.

The flurry of new models coincides with Japan's preparations to host the 2020 Summer Olympics in Tokyo.

No matter what speeds the train achieves during its test runs, it won't match the record-breaking pace of Japan Railway's magnetic levitation, or maglev, train which hit 603km/h on an experimental track in 2015.