Surplus DE15-1500/-2500/-2550 snow-plough locototives by dispalcement with
new snow removing machines introduced by JR East were sold to JR Freight.
They were rebuilt into DE10-3500. They were not eauipped with a steam heating
boiler (SG).
Now DE10-3500 locomotives are used on the freight services of Ishinomaki
line and shunting operation in Kawasaki.