Why are you stuck on 510 ohms? Build a quick test circuit, connect your resistor to the LED and power it with 12 volts, see how bright it is and if the resistor gets hot
I have recently fitted 2 colour 2 wire LEDs to the facia of the club layout and used 110K for the green and 10K for the red and they are very bright. I used a different method to wire them as we are running stall motors so just picked up the 12 volt from the switch that swaps the positive/negative for the motor and used a diode to bypass the 100K for red. I have uploaded photos for you.
Also unless you are only doing one or two, get your LEDs and resistors in bulk from Ali Express. For what you pay for a few of packs of resistors from a retailer you will get everything you need online I got 1000 LEDs for $29 delivered (less that 3 cents each) One of the members asked why I bought 1000 my answer was that the total cost was actually cheaper than 500 on ebay and faster delivery. I'm going to need lots for the 3 colour signalling that also I'm fitting to the layout, that circuit uses a 555 timer to flash the LEDs red/green at high speed so that it shows yellow for the third colour.
Tony
https://ozfreemo.com
https://adelaidemodelrailroaders.com
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