For an indoor display train I purchased a Bachmann 1:20.3 D&RGW caboose (purchased it at the SWGRS). Very nice model, but… I was never happy with the LEDs it came with. The blue/white LEDs in the marker lights seemed alright until I changed the lenses to red and amber. I used 5mm Fresnel LED covers (got mine from Mouser). But the amber lenses looked green when lit. So I guess a white LED and amber lenses make green. The other LEDs in the interior lamps seemed too orange. I suppose this is to simulate an oil lamp. But to me it looked strange. So I replaced all the Bachmann LEDs with Golden White 3mm LEDs (got mine from Ulrich Models). Very simple conversion. Pull out the Bachmann LED and replace with a Golden White LED. All I had to do was cut the Golden White LED leads short enough to fit into the Bachmann LED holders. What an improvement. The marker lenses are all the correct color now and the interior lamps look so much better. I also added a 14 volt bulb to help light the interior. I hooked it up to the truck power wires. I use a 14 volt DC power supply for the display track.
I’m also in the process of painting the grab irons and other parts aluminum. Not sure why Bachmann didn’t do this? Tedious painting, but it looks better.