Mystery Ribbed FCM Automobile Boxcar


Miles C
 

Stumbled across this neat ribbed FCM Automobile boxcar this morning, and I'd like more information about it. 

-Who built these, and when? 
-Did they find themselves in non-auto service (or auto parts service) after boxcars fell out of favor for carrying assembled autos?
-When were the majority of them retired?
-Were they in dedicated service or did they roam? 

Thanks. 

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