An internal combustion engine includes an engine housing, a common rail, and a pressurization device for the common rail which includes a plurality of intensifier pistons, and an hydraulically actuated control valve movable between a first position at which it fluidly connects a source of pressurized actuation fluid with one of said intensifier pistons but not a second one of the intensifier pistons, and a second position at which it fluidly connects the at least one fluid inlet with the second one of the intensifier pistons but not the first one of the intensifier pistons.