A hybrid locomotive comprising: a driver's cab from which the hybrid locomotive is controlled; a power conversion unit wherein power conversion device is accommodated in an enclosure; a power generation unit wherein power generation device and cooling equipment that cools said power generation device are accommodated in an enclosure; a storage battery unit wherein storage battery device is accommodated in an enclosure; and a car body under-frame, set on wheels, that carries said driver's cab, said power conversion device, said power generation unit and said storage battery unit, wherein said car body under-frame has: a car body under-frame-side fixing unit whereby said driver's cab, said power conversion device, said power generation unit and said storage battery unit are connected and fixed with said car body under-frame, wherein said car body under-frame-side fixing unit comprises: a driver's cab fixing frame whereby said driver's cab is fixed on said car body under-frame; a power conversion unit fixing frame whereby said power conversion unit is fixed on said car body under-frame; a storage battery unit fixing frame whereby said storage battery unit is fixed on said car body under-frame; and a power generation unit fixing frame whereby said power generation unit is fixed on said car body under-frame. a driver's cab from which the hybrid locomotive is controlled; a power conversion unit wherein power conversion device is accommodated in an enclosure; a power generation unit wherein power generation device and cooling equipment that cools said power generation device are accommodated in an enclosure; a storage battery unit wherein storage battery device is accommodated in an enclosure; and a car body under-frame, set on wheels, that carries said driver's cab, said power conversion device, said power generation unit and said storage battery unit, wherein said car body under-frame has: a car body under-frame-side fixing unit whereby said driver's cab, said power conversion device, said power generation unit and said storage battery unit are connected and fixed with said car body under-frame, a car body under-frame-side fixing unit whereby said driver's cab, said power conversion device, said power generation unit and said storage battery unit are connected and fixed with said car body under-frame, wherein said car body under-frame-side fixing unit comprises: a driver's cab fixing frame whereby said driver's cab is fixed on said car body under-frame; a power conversion unit fixing frame whereby said power conversion unit is fixed on said car body under-frame; a storage battery unit fixing frame whereby said storage battery unit is fixed on said car body under-frame; and a power generation unit fixing frame whereby said power generation unit is fixed on said car body under-frame. a driver's cab fixing frame whereby said driver's cab is fixed on said car body under-frame; a power conversion unit fixing frame whereby said power conversion unit is fixed on said car body under-frame; a storage battery unit fixing frame whereby said storage battery unit is fixed on said car body under-frame; and a power generation unit fixing frame whereby said power generation unit is fixed on said car body under-frame.