Much of this collection is made up of official agreements and invoices between the Michigan State Highway Department and different railroad companies such as the New York Central Railroad Co., The Pennsylvania Railroad Co., The Chesapeake & Ohio Railroad Co., the Michigan Central Railroad Co.

Also included are large blueprints and plans indicating where the proposed changes would be taking place. These maps focus on the areas where US 131 exist now, as well as the intersection of Kalamazoo and 44th street.

The first box contains materials created between 1926 and 1957. The second box contains materials created between 1958 and 1961. The third box contains materials created after 1961, as well as materials covering large year spans and materials without any indicated date.