While I wasn't sure what train exactly it was meant to be, I did come across a train that looked almost identical to the Number Nine on a book a while ago. This prompted me to search the internet for the badge on the train ("New York Central System") and I found found a bunch of relevant pictures. See this thread:
Certainly a superb-looking train! Although it looks like the one you've stumbled across is a slightly different train to the one in my first picture.