Do not use Rail Ninja - overpriced scam!
Rail Ninja sells tickets with a very big markup compared to the official sites. The tickets are legit at least but that is the only good thing to be said about it. Ordered tickets that had to get downgraded to a lower class and they only issued a small (very random) refund which did not at all cover the price difference. The tickets are now more than double the price of the ones from the official site. They also never sent an actual proper receipt let alone an itemized list of the costs and are completely intransparent about their pricing. Avoid this service at all costs, I will definitely never use it again!