For every Pair of turnouts you end up with a 2 to the power of +1. Example formula is X=2 to the power of Y X being the number of possible layout configurations Y is the number of pairs of turnouts ---< >--- you also can add a 1 to Y by incorporating a reversing switch and yet another 1 for a double turnaround loop one in each direction. refer to second picture. With 4 modules each with only 1 pair of turnouts and the module in the second pic you will have a total of 32 possible configurations. Hows that for keeping it interesting. Here in the states it seems that most like ovals and multicar racing but my wife and I love rallying and as such I wanted to get the most action and assortment out of the smallest possible space.

Hope you like the pictures please offer suggestions, ideas, or even criticism.