Before coming to Sodor, Hiro worked on an unnamed railway line in Japan, which ran through snowy mountains and villages. It was also on this railway that Hiro received the title, "Master of the Railway". Eventually, Hiro was shipped off to the North Western Railway to become the railway's first engine, but he returned to his home railway after he was rediscovered and overhauled. The railway is run by the line's controller, Sir Takaboushi Hideki. Hiro's friends also work on this railway.
The railway only appeared in Hero of the Rails via flashback scenes. Hiro later mentioned it a few times in later seasons.
- In the Japanese version of the special, the 五重塔(Gojūnotō) image from Hiro's flashback of his home is replaced with footage of Hiro talking.
- Despite Hiro working in Japan, the rolling stocks that he is pulling are British.
- Despite the fact that Japan's railroad was built after the Meiji period, there is a railroad in the Edo period.
- Despite being in the Shōwa period where Hiro was built, he is running in the Edo period.