Therefore, there were also many in JNR who stuck to the concentrated traction system, but Hideo SHIMA was an exception who understood and contributed to investigating the characteristics of the distributed traction system from the pre-war era.
そのため、国鉄部内でも動力集中式に固執する者が多かったが、島秀雄は例外的に戦前から動力分散方式の特性を理解し、研究していた。