The Pennsylvania Railroads class F30A flat cars were one of the most numerous classes of flat cars on that railroad with 1500 being built between 1933 and 1934. The PRR utilized a massive onepiece steel casting on these cars, and that sturdy construction meant that many lasted an incredibly ling time. The cars were so successful that the PRR built another 250 nearly identical copies in 1951, classified as F30D. Features. HO Scale F30A 50 Penn Central Flatcar. Pack of 6Specifications. Scale HO Scale