Updated 3/01/2021 - Requesting Help Identifying LED used on Lionel PCB (Photos Added)

Greg: It might help to see a picture of the LED in question. A close-up view of the actual part that you're looking for would be best.

Is this the shape you're looking for?

Just finished taking and editing pictures of the LED.

Photo of marker light LED on PCB.

Width of LED is 2.04mm

Length of LED is 3.71mm

Total height of LED (approx) 5.40mm

Height of LED dome (approx) 2.50mm

Here's a red one that should work.

https://www.digikey.com/en/pro...SSL-LX20465ID/270923

First, thanks to all who replied.

I measure the dome at 2.00mm in diameter at the base.  When lit, the LED is red, but it has a clear enclosure so it doesn't show when the engine is running in reverse.

Well, if you replace both of them, it'll look fine with the red ones.

John you do have a point.

However, before I order any replacement LEDs, the next step is to see if I can successfully remove the bad one from the board without ruining the PCB.  I give myself a 50-50 chance.

Use a fine tip iron and keep the temperature to no more than 500-550F max and you should be fine.

Seems NelsonW nailed it:

US seller and what you're going to do with 23 extras remains to be seen.

What you have going for you is the LEDs are near the edge of the board.  What I'd do is secure the board and place the soldering tip across both solder blobs on the bottom.  The blobs should melt within 2-3 seconds and LED should easily pull-out the top of the board.  Some solder flux applied to the blobs helps

Note that an LED is polarized and must be installed in correct orientation.  The white marking on the Lionel board indicates which terminal (the left one in your photo) is the so-called "ANODE" which will be the longer wire terminal on the new LEDs.

Given the MSRP of the Lionel replacement board, I can see your motivation!

Greg: Great job on the photos! Perfect!

The LEDs arrived in Saturdays mail but I didn't work on the board until today.  Long story short, the red marker light LEDs are working but it wasn't a simple replace of the nonfunctioning LED.  Once the replacement LED was soldered in place, the LED still would not light when 3 volts was applied to the pins in the connector.  When tested directly on the replaced LED it lit up but the second marker light LED did not light.  I had to solder a jumper wire between the two LEDs to make both LEDs light up properly.

Now before you tell me I should have checked for a bad trace on the board to begin with, back when I was diagnosing the problem, when power was applied to the nonfunctioning LED's leads, the other LED would light up.  So at that time, I am certain that the traces on the board were okay.  I most likely damaged the trace when installing the replacement LED onto the board as there was no visible damage to the board when the nonfunctioning LED was removed.  It didn't occur to me to test the board after the LED was removed but I did try applying power directly to the removed LED, still did not light up.

Here is a picture showing the two LEDs lit up after the repair.  LED2 was the replaced LED.

Here is a picture showing the jumper wire.  The trace on the right below the jumper wire is okay, the damaged trace is on the other side of the board.

Now all I need to do is put the repaired board back into the engine and then figure out what to do with the rest of the LEDs.