MÄRKLIN 37990 HEAVY FREIGHT LOCOMOTIV (Insider model 2001) Prototype: Union Pacific Railroad (U.P.) class 4000 "Big Boy" Loco no: 4013 (As it was around 1960) Digital functions: F0:Headlights F2: Smoke generator contact F3:Light loco number sign F4:Light Engineer´s cab lighting and direct control F5:Short or long whistle F6:Bell F7: whistle F8:Steam loco operations sounds. Length over the couplers: 46,5 cm Weight: More than 1200 grams.