In particular large-size steam locomotives for passenger carriages with some exceptions such as the C62 steam locomotives transferred to Hokkaido after weight reduction of the axles was made, disappeared from the first line unexpectedly early because they could not be diverted to those for the sub-trunk line due to the large vehicle body or axle load
特に旅客用の大型蒸機は、軸重を軽くし北海道へ渡ったC62形などの例外を除けば大車体や軸重の関係から亜幹線への転用すら利かず、意外なほど早く第一線を退いていった。