This article refers to a model railway company. For other meanings, see K-line . K-Line Electric Trains is a brand name of O gauge and S gauge model railway locomotives, rolling stock, and buildings. Formerly the brand name under which Chapel Hill, North Carolina-based MDK Inc., based in Chapel Hill, North Carolina sold its products, K-Line is now owned by Sanda Kan, a Chinese toy manufacturer that formerly acted as K-Line's subcontractor. Sanda Kan has licensed the use of the K-Line brand and intellectual property to Lionel. MDK was founded in 1975 by Maury D. Klein. Like competitor MTH Electric Trains, MDK was a large Lionel dealer, and its mail-order ads appeared in magazines such as Model Railroader in the late 1970s. MDK first used the K-Line name on a line of aftermarket Lionel-compatible tubular track as well as a copy of the A.C. Gilbert American Flyer line of two-rail S-Gauge track which Maur