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Also in 2007 Lionel started to sell American Flyer track, the popular 19" radius curve remaining unavailable to this day. In 2008, Lionel released an American Flyer Big Boy with TMCC and Railsounds. 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 ...
This scale is also popular in North America to depict 3 ft (914 mm) narrow-gauge prototypes (using dedicated 14.28 mm (0.562 in) gauge track and known as "Sn3"), and elsewhere to depict the 3 ft 6 in (1,067 mm) narrow-gauge railways (using H0 scale 16.5 mm / 0.65 in gauge track and known as "Sn3 1 ⁄ 2") of South Africa, Australia and New Zealand.
OO gauge was quickly eclipsed by the better-proportioned HO scale. The Lionel range of OO used 19 mm (3 ⁄ 4 inch) track gauge, equating to 57 inches or 4 ft 9 in – very close to the 4 ft 8 1 ⁄ 2 in of standard gauge. There is a small following of American OO scale today.
In track geometry, the horizontal layout involves the layout of three main track types: tangent track (straight line), curved track, and track transition curve (also called transition spiral or spiral) which connects between a tangent and a curved track. Curved track can also be categorized into three types. The first type is simple curve which ...
Before the Maxim joint venture, Lionel had partnered with Learning Curve to create the "Great Railways Adventures" series of battery-powered trains that were compatible with Brio-style trains and track. A specialized plastic track that snapped together was used in place of the traditional peg-and-hole system, although adaptors were sold with sets.
A curve should not become a straight all at once, but should gradually increase in radius over time (a distance of around 40–80 m (130–260 ft) for a line with a maximum speed of about 100 km/h (62 mph)). Even sharper than curves with no transition are reverse curves with no intervening straight track.