The steam drill is a piece of mining equipment that is also of use on the battlefield. A small steam engine, usually alcohol-powered, is used to drive the hammer with such force that it can punch through rock with ease.
Source: Warhammer Fantasy: 7th Edition
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A Dwarf Miner unit using Underground Advance that is equipped with a steam drill may re-roll its arrival dice each turn until it arrives. This represents the Miners taking a shortcut straight through the rock! It is also a nasty weapon in close combat, requiring two hands to use, striking last and conferring +3 Strength to its wielder.