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... watch for on a single-sided tandem: 2_022021_130000001.png 1. The first thing to look at is the relative position of the two switches when snaking the one over the other. A common beginner mistake is to have insufficient distance between the two switches. You need at least 10" scale offset (gauge-face to gauge-face) at the tip of the second switch to have room for the switch blade to open, room for the stretcher bar fixing when it is open, and space for the slide chair: 2_022021_120000000.png A handy rule of thumb for this with REA switches is to align Templot's switch drive slot (tie-bar mark) on the second switch with the stock rail joints on the first switch. This also conveniently aligns the switch tips with the timbering. If necessary you can check the offset with the ruler tool, as shown above. Or judge it by eye -- 3 rail widths in the gap between the rails gives you 11" offset.* *for UK 2.75" rail top. More next time. ...
... the clearance was sufficient.As Martin pointed out in my post you then look to the crossing of the rails and check rails for conflicts. Trevor. posted: 19 Feb 2014 15:44 from: Martin Wynne Trevor Walling wrote: I used the ruler tool where Martin has circled to ensure the clearance was sufficient. If you are using REA switches A, B, or C *, a handy rule of thumb is to align the switch drive slot on the second switch with the stock rail joint marks on the first switch: 2_022021_120000000.png (These switches are facing right to left. In practice the stock rail joint will be moved for a tandem construction.) *The trouble with posting rules like this is that I can guarantee that someone will skip that bit, try it on some other switch, and then post a question about why it hasn't worked. Just to repeat, this rule of thumb is for REA switches A,B ,C only. regards, Martin. posted: 19 Feb 2014 16:00 from: Hayfield Trevor Walling wrote ...
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