Not as robust to handling ('The claw, the claw!') as other traditional seasonal rail cars.
Ergo, if there will be interactive play with the younger generations...we're talking youngsters, kids, grandkids, crawlers-to-toddlers..., especially as the train races around the Christmas tree at floor level, the somewhat f-r-a-g-i-l-e LED strings could be a problem.
That's an opinion based on returns for repair (LHS) of this genre of cars when they first came out a few years ago.
Otherwise, they're definitely eye-candy for that holiday train!
And, no...I've not seen commercially available equivalent strings (LED spacing, size, colors, etc.), but they'd sure be popular if someone offered them, I'm sure.
FWIW...
KD