Abstract: The invention is designed to automatically lay or maintain railroad tracks. The machine is positioned on prior laid rails, with fixing elements, such as track bolts, clips, spring washers and nuts in order to lock the rails to plates already integral with supporting ties. Guides direct each type of the elements along at least one specific routing path that commences at a charging area, passes across a vibrator designed to place the elements in predetermined positions, and terminates at a rotary table designed to accept each type of the elements. Assembly stations expel pre-assembled sets of the elements toward magazines which are able to house, in alignment, a plurality of the pre-assembled sets. The positioning machine is a railroad car which is movable on rails carrying a plurality of the magazines. The pre-assembled sets are sent to laying equipment designed to fix them to the plates. The laying equipment is connected to supports that cause the equipment to inch even when the car is constantly moving.