Posted by Mark G. Gayman on July 20, 2019 
It is common practice to keep a spare set like these near crossings so that they can be easily replaced in case of a derailment, etc. The crossing angle is often very specific to a location and the lead time to manufacture a new set could be too long to tolerate. I saw a spare set near the crossing of the IC and the CB&Q in East Dubuque, Illinois, rusting away in the weeds, many years ago. Molybdenum alloy steel is often used in these parts.
Posted by Erick Anderson on July 25, 2019 
I've never seen a diamond with this much extra metal around the frogs. There must be a reason for it but I'm at a loss.
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