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Railway Infrastructure: The Rot
Saw this while riding along a rail-trail route west of Philadelphia. Evidently they left the catenary support structures standing over the trail to carry the (still energized!) power lines, but the I-beams webs across the trail have rusted completely through.

Rusted railway catenary support Verily, rust never sleeps… I wonder if they ran diesel locomotives along this part of the line?
The beams across the active railway seem to be in fine shape.