Reply to "LED Bulb Replacements dying one by one....."

Here is a thread where it was suggested that the issue could be attributed to the high voltage transients introduced by the switch machine solenoids and that the typical TVS diode may be a good solution (and doesn't require modifying the switch machines!). I would place a 1.5KE33CA TVS in parallel with the bulb as close to it as you can. You could connect one end of it to the screw terminal on the AUX plug (the other end goes to your common ground/outside rail/center post on switch machine)

https://ogrforum.ogaugerr.com/topic/leds-in-o22s