The largest engine at the fairgrounds is this one. Used to pump water for the city of Marshalltown (IA), from 1922-1976 (IIRC, it's been a few years since I actually read that plaque in the corner

). When the engine was retired, it was donated to the museum. In disassembling it for transport, the museum volunteers found that the engine still had its machining marks in the bores. After 50 years of continuous use. That is serious overbuilding.
I love to just sit and watch it run. Listen to the nearly silent generation of significant amounts of power. It's a relic of a different era, so different from what we call "power" today.
Here's a shot of this year's other train (they rotate through a collection of engines). This is the one that we hopped on to ride.
I like the model T that trails behind. It's self-propelled, but is stuck following the train schedule because the trains never stop.
A few times each day, a group of reenactors boards the train and carries out a train robbery. We arranged to be on just the right train to partake in this tradition. So we were boarded and given a thorough robbing.
At the end of the ride, the robbers have a good-ol-fashioned shootout. Very nicely put on. And it's funner to watch it from the train rather than joining the crowd on the grass.
There is a whole village of reenactors doing various historical things. My favorite is the blacksmith shop.
And that about wraps up this trip down to Old Threshers. On the way out we spotted this in the camping area.
And out on the street the local grocery store was running this panel van:
I think it's a nice touch of class for a local business to join in on the fun. Old Threshers is a special place indeed. I'm not sure if they're going to stay frozen in time or continue with their "it must be 50 years old to bring it here" rule. That rule would now allow a 4020 to join in the fun, and that just doesn't seem right at all.
Either way, I'll have quite a wait before my truck will be allowed.