I may be out of line here but please can someone please tell me what the figures 5 and 7.5 mean to identifiy these two pairs of O Gauge 3 rail high speed switches (6021-2 and 6024-5)?
If not, which forum should I send my request to?
Thank you.
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They are a measure of the angle of the frog based on the ratio of how far apart the rails are as you get away from the point. So a #5 means that the rails are 1 unit apart 5 units away from the frog point. A #7.5 means that they are 1 unit apart 7.5 units away. How long a unit is is in-material so long as you use something constant. In real life you can just use your shoe (but we shouldn't be walking on live railroad tracks). For O-scale, figure a 1/4-inch is practical, but use what you want.
Thank you very much for the precision of this information.
It is precisely what I expected.
Jean-Paul.
If your tracks are spaced the Atlas recommended 4.5" center rail to center rail, two 7.5 turnouts connected turnout to turnout, will keep your 4.5" spacing, if needed.
FYI, I can tell you that 4.5" center to center spacing is NOT sufficient for the VL-BB, and most likely a lot of other scale articulated steamers.
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