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We have used piano wire inside a brass tube conected to a DPDT slide switch (one side of the switch is used for power routing the frog and the other can be used for a signal). It works very well. I don't know how much a throtle cable costs but a slide switch, 3' length of piano wire and brass tube comes to about $3. I know the advantage of using the finger flick method is it is simple and you don't have to have any control pannel or track diagram to confuse oporaters.
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