Car End Data

radiodial868
 

Many of the decal sets for resin car kits include "Car End Data", stuff like 'Coupler End Shank 6x8', 'K-2 Triple Valve', 'Friction Draft Gear', 'Cast Steel Yoke', etc..
I see many proto pictures with no car end data, some with it (but unsure of the photo date).  Let's face it, old pictures of car ends are less frequent than side views.
What era were these used? 
RJ Dial
Burlingame. CA

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