From 2006 through 2010, Lionel offered a limited run of K-Line trains called K-Line by Lionel, and issued separate K-Line by Lionel catalogs until 2010.

Many collectors consider K-Line by Lionels' 1:48 scale offerings to be not only the best value, but also the very best mass-produced O gauge trains. K-Line's heavyweight passenger cars are among those exhibited at The Brandywine River Museum Railroad's annual "A Brandywine Christmas" celebration in Chadds Ford, PA. Its 21-inch extruded aluminum passenger cars and licensed Ringling Bros. Circus Cars are prized by 3-rail model railroad collectors and operators world wide.