EFM was doing the ash removal way back in the teens, twenties, thirties with the larger models...much larger!
I've seen them, and these beasts are not made for the "Light in the Sneakers" brigade. I also know of one (not an EFM, but as I remember a GJ perhaps) It was removed in the early 60's, so I was too busy emulating Tiger. and my motto was: every one you miss will be one you never have".....so don't miss often!
..anyway the feed and removal augers were 75 feet long, run by huge (to a little kid)electric motors. Single phase, 220V.
about 6" diameter as I recall. Can't recall much detail, other than it was cool to watch operate.
Could you do it again? Hell yes.....but you need a few minutes to get organized, ignore the traffic noise........
This boiler is now long gone, but the ends are still framed in for a moments notice.