I already know the answer to this one because the train issue was already mentioned in the "don't ask" file, but since we're talking about dream maps, I figure I'm safe. The Raid on Ploesti Flying B-24 and B-15 bombers, along with various fighters, the Americans fly in from northern Africa into Hungary to bomb the German-held oil refineries. Because this is a regular raid, the Germans have rigged up a fast, rolling armored train, complete with mounted flak guns, that essentially runs below the flight path of the bombers. Not to mention lots of German fighters. Yummy fun goodness ensues.