Charles Wales Photo, William Hopkins Collection, early 1948, Washington, DC

The Rock Island added 4,100 Modified 1937 AAR Box Cars to its roster between 1941 and 1945, all from Pressed Steel. Fifty of these cars were for express service. The information about the deliveries is as follows:

Built	Series Start	Series End	No. of Cars	Doors	Notes
12/1941	20000	20039	40	Youngstown	Allied Trucks
1941	20040	20049	10	Youngstown	S-1-L Lateral Motion
1940	145000	145799	800	Youngstown
1940	145800	145999	200	Superior
1941	146000	147549	1550	Youngstown
1941	147550	147749	200	Superior
1945	148550	148799	250	Youngstown	Duryea Underframe
1945	148800	149049	250	Superior	Duryea Underframe