I did! I made 4 brass H/L assemblies with 2 LEDs in each light. Got them painted and installed and they looked great. Applied power and locos ran beautifully and in concert all 8 H/L LEDs blew at once! In all that building and wiring I forgot the resistors!!!! Makes a guy feel pretty dumb!
Well, back to the workbench, good thing LEDs are cheap!
Malcolm