When work is complete, crews will have installed 156,000 wood and 58,000 concrete railroad ties and 24 miles of welded rail and spread 140,000 tons of rock ballast to ensure a stable roadbed. The projects began in January and are scheduled to be completed by the end of May. The concrete ties for this project are being produced by CXT, Inc., at its Tucson, Ariz., plant.

Crews will complete these track improvement projects using Union Pacific's modern track renewal train, the TRT 909. The TRT 909 installs rail and concrete ties in one pass, and can install up to 5,000 ties in a twelve-hour day.

At the Phoenix and Tucson rail yards, crews are stabilizing the track foundation by adding ballast and replacing 46,000 ties. The work will improve operating efficiencies and help Union Pacific continue to enhance the safety of its operations.