This version uses R1 (4 foot diameter) curves and has 36 feet of mainline trackage over an 8.5 by 8.5 L shaped table area. An R2 version would probably fit in a 10.5 x 10.5 table area and have nearly 50 feet of mainline track. Addionally, a piece of R1 track would have to be placed directly opposite each 30 degree crossover in each loop, or very short straight sections of track used to extend the ends of the crossovers slightly (either works).