I'm a riddle in nine syllables: An elephant, a ponderous house. A melon strolling on two tendrils. O red fruit, ivory, fine timber! The loaf's big with it's yeasty rising. Money's newly minted in this fat purse. I'm a means, a stage, a cow in calf. I've eaten a bag of green apples. Boarded the train; there's no getting off. What am I?