bi color led

I think you'll find it's just a bad solder joint in the wire to the LED, the LED is most likely just fine.

The led did not appear to be soldered so I assume an electrically conductive glue was used. The led had already come off the wire leads so I  tested it and  neither side would light. I have tested the leads from the engine and they have power. Non of the larger places like Jameco have a green white bi color led so I'm not sure where to look.

How exactly did you test the LED?

I tested the led by connecting it to the wire leads from the engine. Tried it both ways and neither way it would light.  I have connected a regular led to these same wire leads and it lights up.

Well, that seems a valid way to test it, I guess it's bad.  I think the only folks that can help with this one is Lionel, I don't find those LED's anywhere.

Just spitballin' here, but if the green/white LED has separate leads for each color, might you be able to use two 'chip'-type LEDs, one in each color, and direct their output through the opening, or into a glass or clear plastic bead in the existing opening?

To simulate a control panel in the control station on the bridge model I've been scratch building, I used glass beads wedged into holes drilled through the simulated 'control panel' to redirect light from two flashing and color changing LEDs under the panel:

I added LEDs to a #60 trolley.  The white LED is a 5 mm flat top and serves as a visible headlight.  I then used super glue to glue a flashing red LED behind it.  The CA dries  clear.  In the forward direction the white LED is on, and in the reverse direction the flashing red LED shows quite nicely.  I posted the result here.  I don't know the size or shape of your bulbs so that may not work.

I guess a 2 pin bi color led is just 2 led's hooked up in inverse parallel. (negative led leads attached to each other) So 2 separate led's could be hooked up to each other. I believe that is what you did with the trolley. The polarity reversal between forward and reverse can then light up the appropriate led. I do have some 0402 smd led's that I could use because they are so small and would fit into the front marker housing. The circuit to reverse the polarity is already there. I might try warm white led's as I think that would look better.

For the trolley, I did connect the 2 grounds together, and the 2 positives went to different points on the board that controls the direction (I'm sorry, but I'm not at home and don't remember that part name).  I connected the 2 positives from the lamp on the other end of the trolley to the same points, although obviously I had to switch them for the proper color.

One thing I didn't do that I now know would have been simpler is to use the chip LEDs for the blinking red instead of smaller, flat top LEDs.  They would have been easier to glue and taken up less space.

In my case the 2 leads that come from the engine have their polarity reversed so I would connect the positive and negative led leads together. The white lead wire from the engine appears to be positive by default so the green led's positive lead and the white led negative lead would be attached. The other led leads would be attached to the black lead wire which is negative by default. It would be easier with the correct bi color led but would work.

@Steve Tyler posted:

Just spitballin' here, but if the green/white LED has separate leads for each color, might you be able to use two 'chip'-type LEDs, one in each color, and direct their output through the opening, or into a glass or clear plastic bead in the existing opening?

Well, that's possible, but having to do that to a $2000+ brand new locomotive would be a non-starter for me!

Success! I used 0602 led's that I had, a green and warm white. I can toggle between the green and white now. The green looks exactly the same as the other side but the warm white, while looking better, is not quite the same. The overall repair looks the same, probably a bit better, so I'm happy for now.