STV was selected by Boston’s Massachusetts Bay Transportation Authority (MBTA) to provide engineering and project management services for the procurement of new Tier 4 diesel and battery-electric locomotives, representing both the latest low-emissions diesel technology and zero-emissions propulsion systems, as part of the agency’s regional rail modernization program.

STV’s seven-year contract includes end-to-end support from bid review and selection through procurement, production, and testing.

The program positions MBTA among the early adopters of battery-electric locomotive technology for U.S. commuter rail, supported by mature technology with Tier 4 diesel locomotives designed to reduce pollutant emissions by up to 70% compared with older models.

The effort will replace the MBTA’s legacy diesel locomotives, which have been in service for more than 35 years.

“With more than three decades of experience serving as lead consultant on the majority of electric locomotive procurements in the United States, STV brings unmatched perspective to helping the MBTA put emerging technology into service,” said Derek Stegman, PMP, project manager at STV. “By procuring a mixed fleet of the cleanest diesel technology available and cutting-edge battery-electric technology, the lessons we apply in Boston will help shape the future of commuter rail nationwide.”

The MBTA’s procurement is part of a broader effort in the transportation industry to provide more cost-effective and environmentally holistic options to commuters.

STV has previously supported the MBTA on major rolling stock initiatives, including upgrading to bi-level coach cars to increase capacity and improve rider amenities.