Historically accurate locomotive for the Orient Express

Hey everyone, you may probably be tired of discussions about the Orient Express, but I need you. I ordered it last week, I haven't received it yet, but I've seen all the reviews about the locomotive, which doesn't represent anything very realistic. That's why I need the opinion of experts on the subject: If I want to build a new locomotive, which locomotives are the most historically accurate? The country doesn't really matter, but a black or brown one would be my preference. I like the one...