Railroad pick is another term. Pickaxe is actually kind of an odd term for it, since there's no axe element to it at all. There are variations of this with one end wider, in an adze configuration (edge at right angles to the handle) and axe configuration (edge parallel to handle). Those last are usually called "mattocks" or "pick mattocks." No idea why. English is a language of endless obscurity, as far as word origins.
Myself, I tend toward "pick," or, when needed, "railroad pick." But I get some blank stares with this last phrase.
Regardless, everyone who's used one knows that it's mainly for getting your arms tired and you all sweaty.