The US rail operator Norfolk Southern and Wabtec have announced the continuation of their locomotive modernisation programme, converting 33 Evolution Series locomotives from direct current (DC) traction.
As part of Norfolk Southern’s locomotive fleet modernisation strategy, the units will be equipped with alternating current (AC) traction technology to improve performance, reliability and efficiency.
Wabtec will modernise the ES44DC locomotives by installing AC traction motors, upgraded control systems and advanced digital technologies, converting them into ES44ACM locomotives. This conversion will provide superior adhesion and improved haulage performance, particularly in demanding operating conditions.
The modernised locomotives will deliver higher productivity while requiring less maintenance over their lifecycle. The modernisation package will also enhance locomotive diagnostic systems and maintenance planning, helping to improve fleet reliability.
Locomotive modernisation and the switch to AC traction
Norfolk Southern was the launch customer for the original ES44DC locomotives, manufactured by General Electric (GE), in 2004. Since 2015, Wabtec and Norfolk Southern have collaborated on one of the largest locomotive modernisation programmes in North America, contributing to the conversion of more than 1,000 locomotives from DC to AC traction. The new agreement continues and expands this partnership.
By extending locomotive service life and integrating more efficient technologies, the modernisation programme supports Norfolk Southern’s efforts to reduce greenhouse gas (GHG) emissions intensity, while helping to advance a more sustainable freight rail network.
The modernisation work is being carried out at Wabtec’s facilities in the United States. The first upgraded locomotive was shipped to Norfolk Southern this month, with deliveries of the remaining units continuing through 2027.
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