Abstract: The invention relates to a system for supplying very low voltage electrical energy for at least one electric traction vehicle (30) running on a track (20), and comprising: at least one very low voltage electric power system (10) installed directly next to the track (20); two parallel power supply rails (41, 42) or the like, that are adjacent or distant, a first rail (41) being connected to a terminal (11) of said power supply means (10) and the second rail (42) being connected to another terminal (12) of said power supply means (10); at least one onboard means for storing electrical energy (60) in the vehicle; and at least one onboard power supply means (80) that is joined to the means for collecting electrical energy (51, 52), and is connected both to the storage means (60) and the traction chain (70), such that the very low voltage power supply means (10) feeds the onboard power supply means (80) which, in turn, feeds the storage means (60) so that it stores electrical energy, to its full capacity, in the s