Medium radius (1828mm 72”) Turnout L/HPECO Streamline O CODE 143 Flat Bottom O Gauge LH Turnout Medium Radius The geometry of these turnouts matches that of the Bullhead Streamline range making it easy to use both rail types together, as on the prototype. The SL 713 Transition Track is an ideal way to connect Flat Bottom track to the Bullhead Setrack and Streamline track systems. Peco Streamline Flat Bottom 0 Gauge track is superbly detailed, with correct scale width 'wood grain' sleepers