Sentence:  Their heyday might be in the rear-view mirror, but the region's remaining <WSD>pony kegs</WSD> still sell cigarettes, lottery tickets, six packs and salty snacks. The Gertz <WSD>Pony Keg</WSD> is one of two remaining in Reading, a community that once had six of the little corner stores known for selling small barrels of beer. 
Meaning of the word marked with <WSD> tags:  A drive-through liquor store; "by extension", any convenience store.