Another option ...
Dept 56 makes a low voltage lighting system -- CITY LIGHTS #56 53500. It includes a wall plug, inline transformer to 3V, a distribution strip with 12 jacks, 12 light cords of varying lengths each one with a mating plug to the strip, and bulb sockets that accept a low voltage bulb (they are different from the 110v bulb). Works great.
I have 35 Dept 56 lighted porcelain buildings on my train layout with 3v power to bulbs provided by three distribution strips. The low voltage bulbs illuminate the buildings just as well as the 110v AC bulbs. The low voltage system was introduced in 2005.
NOTE: Animated Dept 56 buildings require a 110v AC light cord and bulb; 110v is needed to energize the animation. I have several of those on the layout.
Mike Mottler LCCA 12394