Union Pacific Seals $1.2B Deal to Modernize 1,700 AC4400 Locomotives
Union Pacific signed a $1.2 billion locomotive modernization contract in Q4 2025 to upgrade its AC4400 locomotives, marking the largest such investment in rail industry history. The deal will retrofit over 1,700 units at Wabtec’s U.S. facilities with deliveries starting in 2027, boosting network performance and efficiency.
1. Modernization Deal Details
Union Pacific signed a $1.2 billion contract in the fourth quarter of 2025 with Wabtec to modernize its fleet of AC4400 locomotives, marking the largest locomotive modernization investment in rail industry history.
2. Production and Delivery Timeline
Upgrades will be carried out at Wabtec's U.S. facilities, with the first retrofitted locomotives scheduled for delivery starting in 2027 and the full program expected to cover over 1,700 units.
3. Operational and Efficiency Impact
The modernized locomotives are designed to boost fuel efficiency, increase hauling capacity and improve network performance across Union Pacific's routes, potentially lowering operating costs and enhancing service reliability.