Another option: Evan Designs sell track powered LEDS that include their own rectifier/resistor module and these can be wired direct to track power. They also come in colors so the problem about your lens can be dealt with that way.
https://www.modeltrainsoftware...eds-for-transformers
The wires on these between the module and LED are quite long and you don't need that but otherwise they are a splice-in replacement if track power is being fed to the existing incandescent bulbs.
