Like O36 and O45 turnouts denote the different radii at which the divergent track leaves the main, #5 and #7.5 turnouts denote the ratio at which the divergent track deviates from the main. So the larger the number, the more slowly it departs from the main. In the case of the #5 turnout, for every 5 units you move along the main, the divergent track is 1 unit to the side of the main. And being they are more straight than curved you can run your train along them faster.
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