During one of his trips to Europe, Mr. Nobutaru Hara visited Sweden, home of the distinctive Swedish State Railways (SJ) Dm3-class electric locomotives. These 1-D+D+D-1 triple-unit locomotives were built by ASEA starting in 1953 to replace O-series locomotives on the Iron Ore Line. Producing 9700 horsepower and 210,000 pounds of tractive effort, the Dm3 could pull 5400-ton iron ore trains.
The Dm3 locomotives worked for almost 50 years, with the last one being retired in 2011 after LKAB replaced them with more powerful IORE-class locomotives. Returning home to Japan, Mr. Hara built a model of a Dm3 in the original SJ reddish-brown livery, which is now on display at the Hara Model Railway Museum in Yokohama.