The Pennsylvania Railroad Company was the largest railroad in the United States in terms of corporate assets and tratffic from the last quarter of the nineteenth century until the decline of the northeast's and midwest's dominance of manufacturing. This small collection consists of six schematic diagrams of racks and signals placed in service or removed from service, mostly in connection with the step-by-step construction of the Philadelphia Improvements of 1927 to 1952.

The Philadelphia Suburban Transportation Company operated bus and trolley lines, many of which originated in Upper Darby Township on the western border of Philadelphia and served Chester, Delaware, and Montgomery counties. Suburban Station and the Fidelity-Philadelphia Trust Company building are both located in Center City. The Red Arrow transportation lines are found in Philadelphia's western suburbs. This small collection consists of photographs of Suburban Station, railroad and trolley tracks, and bus shelters.