ALTOONA, Pa. — Twelve cars of a Norfolk Southern train derailed Tuesday afternoon at Horseshoe Curve — an incident caught by a railcam at the National Historic Site. A February derailment involved 65 cars [see “Norfolk Southern train derails …,” Trains.com, Feb. 6, 2026]. In March, two locomotives and 17 cars derailed near the curve [see “NS train derails …,” March 7, 2026].