Pushing hard up Pennsylvania's famous Horseshoe Curve on September 15, 1984, Conrail EMD SD40 6351 and SD40-2 6437 provide a dramatic angle for David Leonard's camera. Unit 6251 was delivered in 1970 as Penn Central 6251; it became Helm Leasing 5021. Unit 6437 was delivered in 1977 and became Norfolk Southern 3375 in 1998.