The license to manufacture the track had been held by Maury Klein, whose K-Line brand of 0 gauge trains competed against Lionel in the toy train renaissance of the 1980s and 90's and into the 21st. century. When K-Line fell upon hard times in recent years, it was purchased by Lionel LLC, who then got the Flyer track as well as the tooling for two 0 gauge locomotive designs; the UP Big-Boy and the C&O Allegheny. Both of these engines had been tooled to 1/60th. scale so that 0 gauge operators with small layouts and narrow radius curves would be able to enjoy what would otherwise be behemoth engines. Their closeness to 1/64th. scale, however, made these engines naturals for development into the American Flyer Line, particularly since Lionel already possesses tooling for these locomotives in their 0 scale product lines. After considerable delay the company finally delivered the Big Boy in December 2009. No offering has yet been made as to the Allegheny, though collectors and aficionados hold out hope that a sell-out success with the current offering will stimulate the company to proceed further.