Abstract: A railroad tie maintenance machine is configured to detect and seal spike holes in a railroad tie formed by the removal of railroad spikes. The vehicle includes a mothership vehicle and a shuttle cart that are connected by a tether. The shuttle cart is movable relative to the mothership vehicle. The shuttle cart includes a filler workhead having an imaging device, a light source, and an injection wand assembly. The imaging device is configured to take photographs or video beneath the shuttle cart while it travels along the railway. Using a computer vision system, the location of the ties and the spike holes in the ties are identified, after which the injection wand assembly is moved in lateral and longitudinal direction to overlie a spike hole. Thereafter, the injector can be inserted into the spike hole, after which a chemical solution is used to fill the spike holes.