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[quote user="blue streak 1"] Before further discussion of LED headlights.  Are they powered by battery or from an AC source ?  LEDs by their nature are DC powered.  Most home LEDs use a blocking diode that only allows for a half wave of the AC power to go thru the diode to activate the LED.  Any one have an idea of how long after after power shut off to a LED does it continue emitting light ?  More than 1/60th of second ? From what has been posted here about photos seems to indicate that headlight LEDs are being powered by battery ?    <div style="clear:both;"> </div> [/quote] I don't see any reason for LED headlights being battery powered. Allmost all locomotives have at least an inermediate DC circuit. Diesel-electrics produce AC current that is rectified to DC for use in DC traction motors. For AC traction motors the intermediate DC current is converted to AC of variable frequency. On electrics the AC current is provided by the catenary. The locomotive internals are similar. I looked for LED headlight and found these: <a href="https://www.jwspeaker.com/products/led-headlight-model-8770s-locomotive/">https://www.jwspeaker.com/products/led-headlight-model-8770s-locomotive/</a> <a href="http://www.hydra-tech.net/wp-content/uploads/2016/05/locomotive-Spec-Sheet-May-June-.pdf">http://www.hydra-tech.net/wp-content/uploads/2016/05/locomotive-Spec-Sheet-May-June-.pdf</a> <a href="https://www.railheadcorp.com/product/ke-par56-75v-led/">https://www.railheadcorp.com/product/ke-par56-75v-led/</a> The voltage for these is 32 VDC or 75 VDC. There should not be a problem to provide these voltages from the intermediate DC circuit and smooth the voltage for LED use. Regards, Volker Regards, Volker
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