I saw 2912 years ago at Pueblo, CO, when it was undergoing cosmetic restoration. It was indeed a monster. Really stunning, it just appears so large when you're near it. Not sure why, but it hit me a good deal more with its size than the first time I saw the Challenger.
I think it's the drivers. I've seen both 3985 and 4014 up close. They are massive but the drivers aren't huge. I think 80 inch drivered Northerns seem so massive because of the wheel size. Standing next to a wheel that is taller than most people has the effect of making machinery just feel that much larger.