These cars were seen on railroads across North America. Harriman cars were developed during the time of Edward Henry Harriman, who controlled the Chicago & Alton Railroad, the Union Pacific, the Southern Pacific, the Illinois Central, the Central of Georgia, the Pacific Mail Steamship Company, Wells Fargo Express Company, and directed the development of the "Common Standard Specifications" among the Associated Lines. This set of specifications allowed parts to be shared across all Harriman-controlled railroads, allowing economical bid prices due to the sheer size of standardized orders, standardized part inventories and methods for car repair.

These cars were designed with the a distinctive arched roof and diamond underframe crossbearers. The Arched Roof construction handled rainy weather better than clerestoy design - once lighting and ventilation problems were solved. Non-Harriman Arched Roof cars, while similar, had fished-belly underframes developed by Pullman Mfg. Co. and copied by others.  Some of these 60-ft cars remained in use until the advent of Amtrak while others became maintenance-of-way cars.

SP Harriman baggage-express cars had replacement ply-metal doors. SP Harriman Baggage-Express car no. 6206 is a 1912 Pullman with improved facilities for the headend crew, Class 60-B-5. Car No. 6429 is also Class 60-B-5, 1912 Pullman product. At one time it was assigned to Pacific Motor Trucking (PMT) freight services.  The SP two-tone paint scheme for thses baggage cars lasted until retirement.

• Extra fine details,
• crisp paint & printing,
• sliding baggage doors,
• nicely weighted for the runner,
• new adjustable draft gear and 6-wheel truck with 36" metal wheelsets,
• MT Couplers.