O scale
In order to proliferate Trainmaster Command Control as a standard, Lionel licensed it to several of its competitors, including K-Line. Lionel, LLC continued to manufacture and market trains and accessories in O scale under the Lionel brand and S gauge under the American Flyer brand. While most of the American Flyer products are re-issues using old Gilbert tooling from the 1950s, the O scale equipment is a combination of new designs and reissues.