![Delano, Jack, photographer. General view of part of the South Water Street freight depot of the Illinois Central Railroad, Chicago, Ill. May 1, 1943. Image. Retrieved from the Library of Congress, . The original image has been cropped slightly. The original can be viewed through the link provided.](https://i0.wp.com/designbuildop.hansmanns.org/wp-content/uploads/2016/06/20160624_delano_bluflags.jpg?resize=450%2C315)
A recent discussion in a Yahoo email group centered on using prototype elements to slow down the pace of model railroad operations. I had a Wheeling Freight Terminal operating session on the calendar and wanted to add a twist for operating crews to work around. I recalled the above Jack Delano image that featured blue flag protection on several freight house tracks. A few of these markers were constructed and installed on the layout for the operating session.