This is a silly thing to say: it's reasonable to ask about details like this during a project's development. If he was asking "omg when can we have this?? We need this ASAP!!!" then your response would be appropriate.
Except he has been doing this constantly in the thread. I get that he's excited for a train, but what he was asking about is what you would ask about a nearly-completed mod. As far as I know, I don't think that this mod is at that stage of completion.