FasTrack® is designed with a fantastic prototypical look and is easily assembled into an infinite number of designs while providing reliable performance for your trains. 33¾ Degree turnout Includes ¼ curve to complete O-31 45-Degree curve PRODUCT SPECIFICATIONS Gauge O Gauge Brand Lionel Dimensions Length 11 3/8" Straight 33 3/4-Degree turnout Track curves are measured from CENTER RAIL TO CENTER RAIL. The actual area the track takes up is a few inches more to include the track bed. O-31 Curves need 8 curve track pieces for a complete circle – Approximate area will be 3 feet O-36 Curves need 8 curve track pieces for a complete circle - Approximate area will be 3.5 feet O-48 Curves need 12 curve track pieces for a complete circle - Approximate area will be 4.5 feet O-60 Curves need 16 curve track pieces for a complete circle - Approximate area will be 5.5 feet O-72 Curves need 16 curve track pieces for a complete circle - Approximate area will be 6.5 feet O-84 Curves need 32 curve track pieces for a complete circle- Approximate area will be 7.5 feet O-96 Curves need 32 curve track pieces for a complete circle- Approximate area will be 8.5 feet