A rare B&O 2-8-2 "MacArthur" survivor. First time seen in the data base on RP, likely due to the tight confines within the original B&O Mount Clare shops which is where the Museum houses some of the larger engines of it's impressive collection.

From the B&O RR Museum site: Constructed in just 20 days by Baldwin Locomotive Works, the B&O No. 4500 was the first USRA locomotive produced under federal management. The No. 4500 was equipped with the latest technology of its time, including a superheater and stoker. The weight of the versatile locomotive was considered "light" by most standards, yet it was quite powerful.

In the later years of its life, the No. 4500 operated on the B&O's Ohio, Newark, St. Louis, and Ohio River divisions. In 1957, the No. 4500 was renumbered as No. 300 to make room on the B&O roster for four-digit diesel locomotives. That same year, the No. 300 retired from service, and was sent to the Baltimore & Ohio Railroad Museum.

There it was restored to its original number. In 1990, the No. 4500 became a National Historic Mechanical Engineering Landmark.