There were 20 original Heavy Pacifics built in 1919 for the USRA program, and all 20 went to Erie Railroad. From 1923, numerous copies were built, and many railroads operated similar locomotives. There were 81 original Light Pacifics built in 1919, and these were delivered to ACL, B&O, GTW, M&O (GM&O), and L&N. Subsequently, each of these railroads built copies, and several other railroads operated locomotives with similar dimensions and equipment. The Light Pacifics were limited to 54,000 lbs load per axle, versus 60,000 for the Heavy Pacifics, and this allowed the Light Pacifics to run on most main lines. Our Heavy and Light models follow the original USRA designs closely. Railroad specific variations are not modeled on these locomotives. Many Pacifics used the same 10,000 gallon tender as the USRA Mikados, and our models uses this 10,000 gallon tender. In addition to some of the prototypical USRA Pacifics, we are also decorating our USRA prototype in attractive paint schemes that similar Pacifics wore for other railroads, as well as a few striking fantasy paint schemes. Paint scheme in photos are accurate, refer to title for road number.