For many years I have pondered what made the pockmarks on the columns in the Grove St. station. Whatever did it required a large amount of force and must've been done after the columns were build because they are on the rivets also. I have two theories but neither one makes complete sense. One is that they are from an out of control pneumatic riveter during the original construction. The other is that someone was testing the steel. Anyone know the real cause?
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