The Lionel FasTrack O Gauge Plug Expansion Play Accessory Activator Pack Track 6-81317 is a new straight track designed for a three-rail system. Made of plastic and steel, this gray track is in 1:48 scale and is suitable for O gauge model railroads. Released in 2016, this C-10 mint brand new accessory pack allows for easy expansion and play with O gauge model trains.