The Central Railroad Company of New Jersey operated a main line between New York and Scranton with numerous branches within the state of New Jersey. It was one of the more important anthracite-carrying railroads, with important commuter and terminal facilities in the New York area. The collection primarily consists a set of incomplete minutes of parent, predecessor, and subsidiary companies.

The Delaware, Lackawanna & Western Railroad was one of the largest and most prosperous anthracite mining and transporting companies in Pennsylvania. Their records consist of minutes of the DL&W and its two direct predecessors.

The Lehigh Valley Railroad Company was one of the major anthracite railroads and formed a secondary trunk line between Jersey City, New Jersey and Buffalo, New York. Their records consist of minute books, corporate histories, voluntary reorganization plans, and an illustrated brochure on Claremont Terminal.

Chartered in 1871, Reading Company was the holding company for the system of railroads, canals and coal mines assembled by the predecessor Philadelphia & Reading Railroad Company between 1833 and 1896. The collection consists of the corporate records of the Reading Company (1871-1976), the Philadelphia & Reading Railroad Company (1833-1896), the Philadelphia & Reading Railway Company (1896-1923), and 159 predecessors and subsidiaries.