Blog of the Pennsylvania State Historic Preservation Office

Month: October 2025

Preventing Extinction: Saving the Last Wrought Iron Warren Pony Truss in PA

On large stained and moss-covered stone masonry abutments over a single line of tracks in Tredyffrin Township, Chester County rested a dinosaur, a wrought iron relic of the past originally constructed to support the industry of a developing nation. Its appearance was worn and weathered from over 140 years of service.

Random holes and a mixed bag of fastener types and sizes littered the visible faces. The original railroad floor system was long gone and replaced with a timber vehicular deck. Its live load carrying capacity was a mere fraction of what it once was. However, under all of this rust was a diamond, a rare and complete example of a wrought iron pin-connected warren pony truss with built-up corrugated diagonal tension members, the last of its kind.

This is the story of relocation and reuse, adaptive reuse, of the last known remaining pin-connected wrought iron Warren pony truss in Pennsylvania – The Howellville Truss (2004RE01890).

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Pennsylvania Archaeology Month is Here!

October is Pennsylvania Archaeology Month!  Every October, events and programs are held across Pennsylvania to celebrate the Commonwealth’s deep past.

PA SHPO partner agencies and organizations including the the Society for Pennsylvania Archaeology (SPA) and their local chapters, the Pennsylvania Archaeological Council (PAC), as well as local historical societies and universities, offer public archaeology programs for all ages to highlight their region’s archaeological and historical significance. We have a lot of announcements this year so here we go!

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