bunker

Among tank engines, the 0-6-2 wheel arrangement was by far the most numerous, there being nearly 450 of this arrangement, which offers the advantage of good power and adhesive weight, coupled with adequate tank and bunker capacity, within a limited compass.

https://books.google.com/books?id=Dx0GAAAAQAAJ&pg=PA204 Letter X, page 204 At length I came within sight of them, three in number, where they sat cosily niched, into what you might call a bunker, a little sand-pit, dry and snug, and surrounded by its banks, and a screen of whins in full bloom. […] https://books.google.com/books?id=Dx0GAAAAQAAJ&pg=PA223 Letter XI, page 223 And are ye in the wont of drawing up wi' all the gangrel bodies that ye meet on the high road, or find cowering in a sand-bunker upon the links?

Used to refer to a sand-filled hollow in general.

A winnock-bunker in the eaſt, / There ſat auld Nick, in ſhape o' beaſt; […]