The LEDs are to go in a control panel, indicating turnout settings. Now I'm wondering if short strips of circuit board stuck on the back of the panel would be useful in making the connection as well as helping keep the LEDs in place.Just enough of wrapping the bare wire round the led leg to hold the two together while you solder works for me. A heat sink further up the leg to stop heat reaching the led is good practice. Watch the polarity too!
Properly the LED legs would go to holes in printed circuit board ( typically from the reverse) and the wires into appropriate holes connected by the copper strip
Well I'm wrestling with what is involved (switches, LEDs connections etc) So I also am looking forward to what bright idea I come up withIf you can fit it in that would be the “proper” way to do it and could also hold the leds so they line up with any aperture you were thinking of. Will look forward to seeing what bright idea you come up with.