So I am trying to determine whether I need to acquire the Castle Class DLC, which I do not have ownership of. My question stems from the DLC that came with the Humble Bundle, which include the Castle Class Double Chimney and the GWR Castle. What exactly are these two DLC? Is Castle Class a unique item that is meant to be acquired separately? This has been bothering me for a while as I've seen the occasional item requiring it; in this case, South Western Expressways requires it for the "Castle Meets City Railtour" scenario. Will my rewards work or will I need the DLC? (Let's assume for this case that I do not swap it out with Ts-Tools.) Image showing the DLC items is attached.