SL303 SL303 25 Yards Code 80 Streamline Nickel Silver Flexible Track with Concrete Sleepers (25 Pieces Boxed)All new PECO Streamline N Gauge Code 80 flexible track with concrete sleeper base. The concrete sleeper detail is vastly improved from the previous SL 302, with a more prototypical sleeper tie profile, better representation of the Pandrol style rail clip and even the manufacturers name embossed on the surfaced! This takes the level of detail on our N scale track to an all time high! Flexible track with nickel silver rail, length 36 inches, 914mm.