Amtrak Keystone 649 was minutes away.

We pulled over on Hoover Road near Gap, Pa., and I walked into position to catch the westward train in the golden light of late winter evening.

Gazing to the east, I spotted the blue-white headlights of ACS-64 632 as it took the curves at Gap (east of my location) where I’ve often exposed photos of Amtrak trains over the years.

As I exposed this sequence, the engineer gave a us a friendly ‘toot’ from the head end.

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