How do the Menard's box cars look next to a O Scale F3 or GP9?

The Menards cars are exactly the size of a scale 40' boxcar, the only difference is the width is about 3/32 narrower.  If you have a scale boxcar, put it behind and you'll see what it looks like.  I also like the Menards cars are closer coupled than others, makes them look even better in a string.

I posted a review of the Menards cars not long ago.

Review: Menards Reading Boxcars

Here's the thread where I posted the pictures of the comparison to the new Lionel Vision Line PFE Reefers.

RE: (07/02/15) O Gauge Release

Here's the shots from my post.

Good Day John,

Fantastic! Thanks for the pictures and review!

Regards,

Frank

Like this.

Good Day Lehigh, 

Thanks for the picture! Your Geep looks sharp!

Regards,

Frank

The Menards cars are exactly the size of a scale 40' boxcar, the only difference is the width is about 3/32 narrower.

That depends on the prototype box car to which you are comparing.  The mendrds cars are close to the size of a 1/48 scale USRA boxcar from 1918.  They are much smaller than a late 1930-1950s size 40' boxcar like the AAR, Milwaukee Road rib side, X31, B&O wagon top or PS-1

Great........