Box car weathering question.


I have been looking for color photographs to try and make my weathering more realistic. I found the one that is linked below of a Northern Pacific car on Ebay.  I was wondering if the white stuff would indicate the car was in hide service or something spilled and they tried washing it out?  Trying to figure out if this would be appropriate for random cars or only cars in hide service.  

Ebay link to Northern Pacific car

Scott McDonald

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