I have used peel and stick on LED lights for several similar structures, including ceramic Lemax Christmas village items. The ones I have run on 12-18 v AC, but you can get a DC variety as well. Very convenient. Available in a variety of package sizes (4, 20), from a variety of sources, including Lionel. Here's one source: https://www.legacystation.com/...rxJSOHBoCExwQAvD_BwE.
Hope this helps.
Michael