Track will be Peco Code 80, turntable will also be Peco. 36. &163;6. You are going to design and build many types of stuff with your model railroad. The track climbs up to Grant Valley where it is 4 inches above Hazel Green. 12. 3 - Best. Comes in code 83, code 100, and with pre-formed road bed. Search Free N Gauge Track Plans. Bob's Curve and Grade Calculator is an Excel spreadsheet with multiple tabs. . . . Lewis writes 12. . . A simple oval with two siding tracks.