K-Line was founded by Maury D. Klein in 1975, a large Lionel dealer that branched out into building their own products like Mike's Train House, better known as MTH, would do in 1980.
MDK later acquired Marx and Kusan tooling to expand their O27 catalog. Later purchases allowed K-Line to offer O Gauge locomotives, rolling stock, and track. Eventually K-Line was purchased by Lionel, and in time the company's product line was merged or replaced with Lionel equivalents.
Due to MDK's use of Marx tooling, many collectors will utilize K-Line components to restore their Marx model trains!
If you'd like to look at other brands as well, don't forget to check out our whole model train assortment!