Double-Headed GG1’s!

If one GG1 is good, and two GG1's are better, then how much better are two GG-1's running double-headed?  (^_^)  Here are both of my GG1's running together, pulling an extra-long passenger train made up of 18 heavyweight cars, quite a load indeed in the real world, let alone for O-gauge models.  In this True HD 1080p video, you have a perfect chance to compare both of them to see the differences in outward appearance that were engineered in the nine years that separate their manufacture — the newer one (2006) is in front, the older one (1997) brings up the rear.  You'll note that they run very smoothly together even though the older one was converted from PS1 to PS2.