There are a couple of web sites where you can download addons for pak128.Japan

• http://japanese.simutrans.com/index.php?Addon128Japan
• http://wikiwiki.jp/twitrans/?addon%2Fpak128.japan
• https://sites.google.com/site/htrsimu/
• http://simu7japan.blogspot.jp/
• http://sc2.s27.xrea.com/game/simutrans/
• http://www.himawari-design.com/simutrans/
• http://jomoyaman.blog.fc2.com/blog-category-8.html