>>Not so fast there, Hot Water. We agree that “GG” stands for 4-6-0 back to back. But knowing that the “1” stands for the first design, CLEARLY the sawed in half GG1 is “half” of the first design. Therefore, appropriately called a G1/2.<<
Wouldn't be more appropriate to call it a 1/2GG ?... or a GG0.5 ?