In 1954 a JNR C62 steam locomotive ran on Kisogawa Bridge on the Tokaido trunk line at a speed of 129 km/h, which was 'a speed record of steam locomotives on the narrow gauge railroad,' however, this record was made in the process of a series of speed tests to see if an old-type truss bridge called a pin jointed truss could stand high-speed driving in the coming age of electric trains under an atypical situation that the tests were performed on the C62 steam locomotive alone from various limitations.
国鉄C62形蒸気機関車は1954年に東海道本線木曽川橋梁上で129km/hという「狭軌鉄道における蒸気機関車の速度記録」を樹立したが、この記録はピン結合トラスと呼ばれる古いタイプのトラス橋が来るべき電車時代に高速運転に耐え得るか否かを調査する目的で行われた、一連の速度試験の過程より得られたもので、さまざまな制約からC62形単機での試験が実施されるという、特殊な状況下で成立したものであった。