Union Pacific Builds New Rail Line in Arizona Desert
Published Date: 3/17/2026
Notice
Summary
Union Pacific Railroad is getting the green light to build and run about six miles of new rail in Maricopa County, Arizona, connecting a big manufacturing zone to their main line. This new track will help companies like Commercial Metals Company move freight more easily and offer future shippers a fresh option. The project passed environmental and historic checks with some conditions, and construction can move forward soon without extra approval delays.
Analyzed Economic Effects
4 provisions identified: 3 benefits, 0 costs, 1 mixed.
New 6‑Mile Rail Gives Shippers a Rail Option
Union Pacific may build and operate approximately six miles of rail in Maricopa County to connect the Pecos Advanced Manufacturing Zone to UP's main line. The Line will provide rail service for Commercial Metals Company and is expected to eliminate an estimated 35,000 truck trips per year (10,000 from current operations and 25,000 from a new facility).
Train Timing and Crossing Limits to Reduce Delays
The Board requires UP to operate trains on the new line outside peak periods (avoid 6:00–9:00 a.m. and 3:00–7:00 p.m. to the maximum extent practicable) and not to block at-grade crossings for more than 10 minutes when reasonably practicable. UP must also consult before increasing trains beyond two per day and comply with local requirements before routine peak-period operations.
Construction Rules for Dust, Noise, Hazmat, Permits
The decision imposes specific construction and environmental mitigation: dust control (water trucks), construction noise time limits (construction noise limited before 7:00 a.m. and after 5:00 p.m. to the maximum extent practicable), hazardous materials planning and spill response, and required permits (e.g., Section 404 and stormwater permits). Contractors must implement these measures during project-related construction.
Project Expected to Support Local Jobs and Growth
The Board notes the project is expected to drive economic growth and expand high-skill manufacturing jobs in Maricopa County and to support CMC's operations in Mesa. The project has been described as facilitating expanded manufacturing activity in the Pecos Advanced Manufacturing Zone.
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Key Dates
Department and Agencies
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