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In using 2 switches to create a crossover in parallel main lines, what is the centerline distance of main lines for each number?
the frog number (e.g. #4, #6) is a measure of the frog angle (see Turnouts) in terms of the ratio of the distance from the tip to the separation of the rails. the larger the frog number, the smaller the angle
in a crossover, a longer distance will be needed the smaller the angle.
the distance from the points to the frog, the lead length, is also longer the smaller the angle.