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.

William Hollis (1868-1908) was a telegrapher working a block station of the Pennsylvania Railroad at Marietta, Pennsylvania. The pocket diary primarily documents his record of work in 1891, including assignments, discipline for mistakes, travel to headquarters, and records of many accidents - but also includes occasional references to entertainment he attended.