The efficient bar car on board The Canadian, Canadian National's flagship passenger train. The bar is well-stocked, but because it's on a train it's also really small. From what I know, tall fat people like me would have a hard time staying employed as staff on a train since we're simply too big to be helpful.
The bar car, though, has the most comfortable seats on the train. I guess not many people sit there, although the bar is certainly popular and the bartenders are always busy.