Records collected by Christopher P. Wahmann during his career as a manager in the Operating Department of Amtrak between the mid-1970s and mid-1990s, including Amtrak documents and those of other railroads and commuter agencies over which Amtrak operates or that operate trains over Amtrak's lines.

Karl Gabosch (1932-2008) was an employee of Pennsylvania Railroad Company and its successors, Penn Central and Conrail. The collection consists of a sample of company manuals, internal publications, and maps that were issued to him over the course of his career.

MCI Communications Corporation (MCI) was a large telecommunications company. It was organized in October 1963 in Joliet, Illinois, by John D. (Jack) Goeken (1930-2010) as Microwave Communications, Inc. Goeken and his partners were planning to provide point-to-point private line microwave communications between Chicago and St. Louis to small businesses. This small collection of MCI documents primarily concerns customer service support, branch service, billing/system problems, and internet services.

The Pennzoil Company is a large oil-producing, refining, and marketing company established in 1913. Its largest product is synthetic motor oil made from natural gas. This item is a single volume containing four parts; it was intended to provide new employees with an orientation to the company and the oil and gas industry.