A railway power car, particularly for the transport of passengers, said power car comprising a body extending in a longitudinal direction; the body comprising a floor and two side walls defining a technical room, the power car further comprising cabinets accommodated in the technical room, said cabinets being intended to house electrical and/or electronic and/or pneumatic equipment; the power car comprising at least two rails disposed on the floor, each of said rails extending in the longitudinal direction with preferably a substantially constant cross-section, an upper part of each of said rails forming a first means of joining with a cabinet; characterized in that the upper part of each of the rails exhibits a slot extending in the longitudinal direction and oriented upward; each cabinet comprising at least one foot, said or each foot comprising a second means of joining (60, 62) capable of mating with the first means of joining of one of said rails, each first means of joining and each second means of joining being configured so that each cabinet can be fastened to said corresponding rail at an infinite number of positions along said rail; two of the rails being disposed on either side of a central corridor extending in the longitudinal direction in the technical room, the cabinets being disposed along the side walls on both sides of said central corridor; the railway power car further comprising a gutter disposed on the floor in the central corridor, said gutter extending in the longitudinal direction, said gutter being intended to accommodate equipment cables and/or channels of the power car; the railway power car further comprising plates assembled above the gutter and distributed along the longitudinal direction. the power car further comprising cabinets accommodated in the technical room, said cabinets being intended to house electrical and/or electronic and/or pneumatic equipment; the power car comprising at least two rails disposed on the floor, each of said rails extending in the longitudinal direction with preferably a substantially constant cross-section, an upper part of each of said rails forming a first means of joining with a cabinet; characterized in that the upper part of each of the rails exhibits a slot extending in the longitudinal direction and oriented upward; each cabinet comprising at least one foot, said or each foot comprising a second means of joining (60, 62) capable of mating with the first means of joining of one of said rails, each first means of joining and each second means of joining being configured so that each cabinet can be fastened to said corresponding rail at an infinite number of positions along said rail; two of the rails being disposed on either side of a central corridor extending in the longitudinal direction in the technical room, the cabinets being disposed along the side walls on both sides of said central corridor; the railway power car further comprising a gutter disposed on the floor in the central corridor, said gutter extending in the longitudinal direction, said gutter being intended to accommodate equipment cables and/or channels of the power car; the railway power car further comprising plates assembled above the gutter and distributed along the longitudinal direction.