That's a great idea and should be a fan favorite on your layout! At the club we attached pvc pipe to the hole in the bottom of the layout (a barge actually) which empties into a 5 gal plastic bucket. Makes it easy to use a scoop to put the coal back in the hoppers once dumped and the pvc pipe keeps the coal from going all over the place. Of course, if you forget to put the bucket back you'll know soon enough.
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