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[quote]QUOTE: Originally posted by Leon Silverman By using different color LED's at each location, a uniform color along a route would assure me that the polarity did not switch from block to block. [/quote] Could you not just wire a Red LED/resistor across the block gap to show block polarity, if the polarity was different the LED would light... You could also wire a 2nd Green LED/resistor across the block gap but to the other rail, if that polarity was different then it would light meaning polarity on the other rail was different... Here's GOOD LED site http://www.superbrightleds.com/led_info.htm And SPACEMOUSE, Your original idea would have worked very similar to the DPST w/N.O. pushbutton. You just approached it from a different prospective... One switch for LED the other for Turnout... DC voltage is typically used for LEDs, but not absolutly the only way. When AC voltage is rated i.e. 17VAC the actual voltage is much more from the "Peak to Peak" on the waveform, its been awhile since school, but I think its 1.4 (?) times larger so for a little while your voltage is 23.8 volts. http://www.ibiblio.org/obp/electricCircuits/AC/AC_12.html scada
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