"Adding 1,000 more wayside detectors will create more work in the craft," said Michael Baldwin, president of the Brotherhood of Railroad Signalmen.
There is no federal mandate for detectors, including the hot box detector, to be inspected.
"Norfolk Southern has hired and trained more than 150 new signal employees, and we continue to hire.
We are committed to the safety and integrity of our defect detectors," said Connor Spielmaker, Norfolk Southern spokesman.
Total Class I freight rail employment in January 2023 was 119,245, up 6.7% (7,491 employees) over January 2022.