Idiom Magic:輕易賺大錢的工作/優差 A / the gravy train

【明報專訊】I saw Fergus down by the railway track holding out his hat. "I've heard about this thing for a long time," he explained, "and today I'm going to see if I can get something from that gravy train for myself!" I didn't say anything, of course, but I knew that a gravy train or the gravy train isn't really a train. It's a way of referring to a job where one earns lots of money without having to do much work. "I know that," Fergus said. "That's the reason I'm standing here waiting for a gravy train!"