There is no DAIR 3801, and there probably never will be. But I wanted a four axle unit with sound in DAIR colors. I already have a DAIR 20 (from a Lifelike GP 20) without sound. I got a hold of a sound Atlas/QSI GP38 and I already had some undec shells, so I went for it. It seems like many shortlines number their GP38s in the 3800 series, so that was the reason I numbered mine 3801. No basis in reality whatsoever besides this and the handsome paint that the real D&I Railroad units wear.