These cars all use the the pre war 2755 frames. The 2755 came with 4 warning placards and 4 corner steps. Many of the post war versions had some of these details reduced or eliminated, ie two warning placards and zero corner steps.
The repro parts guys have these parts if you want to add the detail back. In the case of the corner steps they can be made easily with staples from a staple gun.
Pete
