Earlier quoted context omitted.
I think the term you're looking for is Ponzi scheme. Much like Bernie Made-off... err Madoff operated. Or perhaps more recently: Groupon. A classic pump and dump, take a look at the charts. Your 'train analogy' is merely painting a glib picture of what is clearly insider trading by the likes of Goldman Sachs in a different, albeit obvious, guise.
You are conflating completely different kinds of stock scams.
Goldman Sachs is the underwriter (and reason enough to scoff its initial valuation and then spike in price) of the IPO in question, hence the pump and dump; JP Morgan was taking a billion in fees for services rendered while Madoff laundered his money there.