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starfyredragon t1_iu1zagt wrote

And they just had to use it to transport coal... why?

3

Northwindlowlander t1_iu25wjl wrote

Because it's a static, homogenous cargo probably, almost as good as a non-cargo ballast. Better for data collection on the effect of hte sails

7

misimiki t1_iu4pag2 wrote

Because in this case it's coals from Newcastle.

2