from LNBC's post at
Work in Progress: Zoo topic
This awesome tool is hidden at
japanese.simutrans.com links section and it allows you to port almost every kind of object from pak128 scale to pak64 scale, with very good results, take a look..
(http://img13.imageshack.us/img13/1558/resizeobjpreview.th.png) (http://img13.imageshack.us/i/resizeobjpreview.png/)
It's a command line tool with several parameters that allow you to control the amount of anti-aliasing, the special night colors and the image size. You can also convert vehicles. The windows binary and the source code are available for downloading at
resizeobj homepage (http://www.geocities.jp/wa_simutrans/resizeobj.html)
P.S: I recommend you to use an online translator, as the whole website is in japanese.
Well, teh biggest problem is, that pak64 scale is roughly at pak80, by pak64 scale. Nevertheless a very useful too even I was not aware of.