Mermaids were another regular wagon.
We aren't bothered about those though as they are designed for side tipping ballast on a 2 track railway, not much use on a single line.
However to tip them the guys used to have an enormous wheel that was attached to the winding mechanism on the side away from the tip.
The wheel, if I remember right, was about 6ft diameter. Replaced in the 80s with a small powerpack and large socket, made the job a lot quicker.
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