We've just finished building the Holiday Main Street set. We took some tracks and the power unit from the older kid's Lego train set so we could have the tram running, and put it all under the tree (I had to get the powered up light part from a guy in the Czech Republic though, because it was out of stock at Lego and everyone here was charging extortionate amounts for it).
And a little video of it running if this works:
View attachment holidaymainstreet.mp4
Main problem now is that the three year old has worked out if he makes it go fast enough it derails and he finds it hilarious! So a lot of tragic crashes on holiday main street this year.