This NEW in the box O Scale K-Line Model #K761-2112 Union Pacific R.R. Challenger Boxcar measures 12″ long coupler to coupler. The car features an accurate paint scheme, real life metal detailing and die cast trucks. This car will run on 031 or larger curves. The car is a split out from a three car K-Line set #K761-2011A, that a large Southern K-Line Superstore had K-Line make for them on a special order basis, just before K-Line entered into bankruptcy. K-Line train cars are getting harder and harder to find in NEW condition. USPS shipping.