Bob Chaparro asked:
"Photo: Boxcar Door Stenciling (Circa 1943)
A photo from the Detroit Public Library:
Click and hold to enlarge photo.
The door is stenciled "9-5", "10-6" and "8-E".
Note that the car is a Pere Marquette automobile boxcar and has the stripe indicating that it's equipped with an Evans Auto Rack. "9-5" indicates IH with the racks stowed; "10-6" indicates IH with the racks deployed, and "8-E" indicates the specific type of rack.