Thank you for posting this. I also collect New Marx et al Christmas cars, and this gives me a bit of info as to what was made that I haven't seen.
Here's a picture of my Christmas train:
The engine and tender are original Marx (I repainted the engine), followed by a green Christmas tree flatcar, a Santa in door boxcar, a Rudolph in door boxcar, the musical Santa's private coach, and a Christmas caboose.
J White