Hiro is a wise Japanese engine who was introduced in Hero of the Rails.
Hiro was the first Japanese steam engine to arrive on the Island of Sodor and was originally know as the "Master of the Railway". Hiro is one of the oldest and strongest engines on the Island.
Hiro is wise, very dignified, and enormously kind. He is friendly and is able to find good in any engine he meets. He does not appear to hold a grudge; in his first appearance, he helped Spencer after an accident, despite Spencer previously trying to send Hiro to the smelter's yard. Hiro later had to work with Diesel 10 and Salty at the docks and Diesel 10 didn't like him and wanted him scrapped along with Thomas and all the other engines on Sodor including Bash, Dash and Ferdinand Hiro wanted to get away from Diesel 10 and Sodor this made him very worried. Hiro has a fear of being scrapped.
Hiro is a wise, kind, and gentle engine. Whenever an engine has a problem, Hiro will always be there to help. Occasionally he gets homesick.
BasisEditHiro is a Japanese National Railways (JNR) Class D51 built by Kawasaki. However, Hiro runs on standard gauge track, while the real D51 engines were built for cape gauge. Though Hiro's number is a reference to his class, there really is a D51 with the number 51. However, unlike Hiro, the real engine is an earlier build of the D51 class, with its dome flush with its funnel. It is preserved at Torokko Saga Station in Kyoto, Japan.
- Togo Igawa (US/UK; Hero of the Rails onwards)
- Hiro says that he is the oldest engine on the Island, but the D51 class was not built until 1936, making him much younger than most of the other steam engines on the island.
- Like Hank and Flora, Hiro has only been partially modified to work on Sodor. He has been scaled up to standard gauge, and has been given buffers on his front and his tender. But oddly enough, he has a loose coupling on his tender, and a knuckle coupling on his front. This would make pushing rolling stock or being pulled away by another engine physically impossible, unless a special adapter used to connect knuckle couplers and loose couplings was fitted onto his knuckle coupling.