Hi
I don't know if there is already a thread about it. I found the BAB (Bitmap Animation Builder) by OverPop on SC4Devotion.com which makes it possible to create moving objects in SC4.
(Pictures by OverPop)
It's already existing a manual as a download by denham2010.
It's only working with gmax, not with 3dsMax.
Links on SC4Devotion.com
https://www.sc4devotion.com/forums/index.php?topic=8003.0 general talk
http://myrovp.fromc.jp/SimCity4/BAB/Readme.htm install and uninstall
http://myrovp.fromc.jp/SimCity4/BAB/BABHelp.htm tutorials
https://www.sc4devotion.com/csxlex/lex_filedesc.php?lotGET=2082 download
I hope this is the right place and I'm able to start such a thread.