The Delaware Coach Company was originally incorporated as the Wilmington & Philadelphia Traction Company on June 25, 1910, and operated an electric street railway line from Wilmington, Delaware, to Chester, Pennsylvania, and to Philadelphia. Throughout the early twentieth century, the company purchased stock in and leased numerous electric railway, transportation, and utilities companies in the Wilmington and Chester areas. In 1941, it changed its name to the Delaware Coach Company as trackless trolleys and buses replaced electric streetcars. Included are official documents and correspondence; personnel and financial records; public relations files; land deeds; legislation; labor agreements and contracts; equipment, fare, and route policies; ordinances; minute books, and other miscellaneous material created by Delaware Coach and its predecessor electric streetcar companies.

The collection consists of 46 nitrate negatives and one folio filled with 46 vertical aerial photographs of New Castle County, Delaware and the surrounding areas, including nearby southern Chester County, Pennsylvania. The flight altitude was approximately 25,000 feet and the resulting vertical photographs had a scale of approximately 1 inch to 3,100 feet.

Henry du Pont (1812-1889) was an American military officer and son of Eleuthère Irénée du Pont (1771-1834), founder of E.I. du Pont de Nemours & Co., and Sophie Madeleine Dalmas du Pont (1775-1828). In the year before he died, du Pont released a mortgage he held to Anna B. Stidham (1854-1918) for land in New Castle County, Delaware.

Northern Delaware (current day New Castle County) was settled by Swedes in the seventeenth century. This collections contains ten aerial photographs of the Northeastern Delaware border with Pennsylvania, along the Delaware River.

Pierre A. Gentieu (1842-1930) was a long-term employee of E.I. du Pont de Nemours & Company who created an invaluable photographic record of the company's Brandywine Mills at the turn of the century. This is a small group of photographs related to northern New Castle County, Delaware. There are two photographs taken by Pierre and Frederic A. Gentieu, father and son, who photographed an August outing with a large group of men, women, and children.