Paul, this is likely being done to space the weight load over trackwork still under construction. There are several guys visible at rest (and an enginemen to supervise) around the scene, no doubt all part of the track crew which is probably tamping ballast. The weight of those two big engines coupled together under load could have shifted the alignment under those conditions. Another possibility would be to keep the weight separated for a bridge or culvert that was being strengthened in the area.
Probably not the same train. Is this also attributed to Otto Perry? If not, it's probably Brownie Anderson.
By this time, #75 was probably already set aside and out of service.
Also, it is obvious that the boxcars in the first picture are empty, as they would be way over tonnage if full, even for these engines.
Interesting to note in the head end photo Chris posted at Three Mile Tank, you can clearly see that #76's tender still shows an almost full load of coal. In the header photo, which is a different train below Climax, the upper coal gate on #76 has been stowed behind the bunker. Evidence of tons of coal and lots of water having been fed into those engines in a relatively short distance.