Founded in 1846 with headquarters in Philadelphia, the Pennsylvania Railroad Company (PRR) was an American Class-1 Railroad that pervaded early American culture. As a chief source of employment and transportation, the PRR served as a national symbol of America's progress as a leading industrial nation. This item is a poster featuring an E6s Atlantic class locomotive on the turntable at the Pennsylvania Railroad's 46th Street Enginehouse in West Philadelphia. The poster was created to celebrate 150th anniversary of the Pennsylvania Railroad's charter.

The Joseph D. Lovell Locomotive Rosters constitute a partial roster of Pennsylvania Railroad steam, electric and early diesel locomotives to 1946. The collection also contains seven small ledgers listing the production of not only the Juniata Shops, but also the earlier Altoona Machine Shops (1866-1904) and locomotives purchased from outside builders, principally the Baldwin Locomotive Works. His lists include rosters for both the Pennsylvania Railroad proper and its predecessor lines.

There is also a folder containing copies of letters and notes by Robert B. Watson documenting the provenance of the records.