What Do You Guys Call Non-Scale Rolling Stock When Selling Them ??

Traditional sized?

Call it a non-scale O gauge car.

I'm not sure why your worried about it.I know what I am buying when I see it.For example,as soon as I see the box shown in your pic I know I'm NOT interested.

Just call it "O gauge" and you're covered.  O gauge covers everything from postwar shorty boxcars to modern scale-sized RailKing-type stuff, including the hopper you pictured above.  As soon as the term "O scale" appears, I and many others expect the item to be 1:48 scale.

O gauge and include the item number, if known.

I put Traditional and list the item number.

Toy trains???

Lionel calls them Traditional sized. MTH calls it Railking. Atlas calls them Industrial Rail.

This size is all I have room for anyway. 

Use the manufacturers description. If you can't find that, do as Silver Lake suggested.

Other than using the manufacturer's description as Moonman suggests, I would use traditional O/O27 size. A lot of people (outside the hobby primarily) confuse O scale with O gauge, so I think "size" is a better word choice.

-John

I've heard it called "semi-scale" and "traditional."  Most often someone says its a Railking, Lionel Traditional, etc., so you know.

Like others who have posted, I use the term "traditional size" for Lionel and similar rolling stock meant to run on 027. "Semi-scale" is appropriate for Rail King and other items that are smaller than scale but a notch up from traditional in terms of detail. Also most Rail King is actually bigger than traditional Lionel. 

"Traditional" or "semi-scale."