"Post No Advertisements"?
In my collection are several pictures of Cotton Belt
wood sheathed boxcars built in the mid-1920's. On the
upper right side of some of them is stenciled the
admonition "Post No Advertisements". Why was this
necessary? Were people in the habit of hanging signs
from railroad cars in those days? Or was this part of
the prohibition against billboard advertising on freight
cars? Betcha there's no decal for this...