Doctor Yellow Shinkansen: The Iconic Test Train

Doctor Yellow Shinkansen

The Shinkansen network of high-speed bullet trains in Japan has a great safety record, thanks in large part to Doctor Yellow, the Shinkansen test train.

The Doctor Yellow Shinkansen is so named because it literally diagnoses any problems with the track and overhead wires as it speeds along, and is painted yellow instead of the regular white to make the trains more visible at night.

However, the color yellow also symbolizes happiness in Japan, and many Japanese locals believe that a rare sighting of this distinctive diagnostic train makes you happy and brings good fortune.

Doctor Yellow is also the fastest vehicle operating on the Shinkansen bullet train network, and often reaches its full speed of up to 443 km/h in order to properly test the tracks.


Doctor Yellow functions

Doctor Yellow is regularly deployed on Japan’s rail lines in order to ensure that the standard gauge track used for Shinkansen services is sufficiently level and stable.

Shorter than most Shinkansen trains at only 7 cars long, Doctor Yellow contains sophisticated monitoring equipment that analyses track alignment and wear in overhead wiring.

doctor yellow train

It usually carries a 9-strong crew, consisting of 2 drivers, 3 track technicians, and 4 workers to analyse power-related issues, who monitor the data collected and relay any concerns to maintenance crews to repair the problem.

There are 2 types of inspection methods employed by Doctor yellow:

  • The “Nozomi inspection“, which runs on the high speed lines of the passenger train of the same name.
  • The “Kodama inspection”, which tests stations where trains do not pass at high speeds.

Additionally, if there is an earthquake in Japan, or unusual vibrations are reported on a section of Shinkansen track, a Doctor Yellow train is immediately dispatched to the area to test its safety.

Tokyo to Hakata line

Doctor Yellow most commonly runs on the Sanyo Shinkansen and Tokaido Shinkansen lines from Hakata to Tokyo. Hakata station is located in Fukuoka on the island of Kyūshū.

There are actually 2 slightly different models of the diagnostic train, one which operates on the JR West line from Shin-Osaka to Hakata, and the other which serves the JR Central line from Tokyo to Osaka.

An additional test train, named East-i, serves other Shinkansen lines across Japan, but its white-and-red striped design has not yet attracted the same cult following as Doctor Yellow.

doctor yellow and n700 trains

Doctor Yellow schedule 2020

Unfortunately, Japan Rail does not publish a Shinkansen timetable for the operations of Doctor Yellow, meaning that no-one knows for sure when one of the distinctive service trains may be seen.

However, this only adds to the mystique and lucky reputation of the Shinkansen, and many Japanese train enthusiasts (known as densha otaku) make a sport out of spotting Doctor Yellow.

A number of online forums and bulletin boards in Japan allow users to share sightings of the Shinkansen and suggestions on where and how to see it next. There is even a dedicated Twitter account which live tweets Doctor Yellow sightings as it passes along the Sanyo Shinkansen line.

How to See Doctor Yellow

It is often possible to predict the movements of Doctor Yellow based on confirmed driving times and sightings from previous years:

  • Dr. Yellow usually makes 3 “Nozomi inspection”round trips from Tokyo to Hakata Station in Fukuoka per month, for a total of 36 round trips per year.
  • Operating day rules dictate that the average interval of Nozomi inspection is 10 days, but it may vary between 8 to 10 days. The first trip usually takes place between the 1st and 10th of every month.
  • A “Kodama inspection” is performed less frequently, around 8 round trips per year.
  • Doctor Yellow trains are also often sent to a maintenance facility in Hamamatsu for regular inspections, approximately once every 9 months. This provides a good opportunity to see the trains as they enter and exit the factory.

If you are planning to track down Doctor Yellow and take some pictures of the elusive Shinkansen, it’s important to note that flash photography of the train is prohibited in an effort to avoid dazzling the driver.

Interior Tours

As all of the windows on a Doctor Yellow are blacked out, it is not normally possible to see any of the maintenance equipment inside the train.

However, both JR West and JR Central occasionally hold contests to allow winning participants the chance to take a tour inside Doctor Yellow trains, a rare opportunity that many Japanese people consider to bring good fortune.

doctor yellow inside

However, even if you aren’t lucky enough to win a place on an interior tour, you can still take a little piece of Doctor Yellow back from your trip. A range of merchandise depicting the famous train, including T-shirts, backpacks, sneakers, and USB sticks, is available for sale across Japan.

doctor yellow shinkansen merchandise

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