Oh also, regarding blackburrow - the reason you could pull such trains is because lazy aggro ignores the z-axis. Blackburrow is basically 3 levels, one atop the other around the same grid.
Chardok has a few areas where the grid overlaps levels so the z axis is ignored there and you could pull a decent amount of mobs through that z axis but most of it resides in its own grid area and so it's nowhere near similar in terms of trains from below.
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