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Union Pacific will use a modern track renewal train, the TRT 909, which installs rail and concrete ties in one pass. The TRT can install up to 5,000 ties in a twelve-hour day. The track renewal train consists of approximately 30 rail cars, with each car capable of carrying 210 concrete ties. Three sets of gantry cranes move the concrete ties forward for the TRT to drop into place and the machine then threads the new rail onto the ties. The old wooden ties are picked up and discarded rail is threaded out as the machine works its way down the track. A conveyor positions the removed ties for the gantry cranes to load them onto railcars for movement to a facility for sorting.