The Milwaukee Road Steam Locomotives L Class Mikados on the back cover has a picture taken at Wisconsin Dells on October 3, 1940 of a newly shopped single sheathed boxcar from the B end ladder forward (number unreadable) showing a bracket grab iron used as the top rung of the side ladder to reduce problems from the side roof overhang. A review of the Sunshine Prototype Data Sheet #47A pictures of these cars does not show bracket grabs used as the top side ladder step.
The boxcars were in both the 70500-708499 and 708500-713999 series. Since I built 3 of these kits without bracket grabs, I will do the fourth one with them.