• About Japan Rail Pass  (Note : cannot be purchased inside Japan)
  
• Hokkaido Railway
• East Japan Railway
• Central Japan Railway
• West Japan Railway
• Kyushu Railway
  
• Japan Freight Railway
• Railway Technical Research Institute
• JR Bus Kanto

• Tokyu Car Corporation  (Railway Division)
• Nippon Sharyo, Ltd.
• Kinki Sharyo Co.,Ltd.

• Transportation Bureau, City of Yokohama
• Odakyu Electric Railway
• Keihin Electric Express Railway
• Tokyo Metro  (previous Teito Rapid Transit Authority)

Unfortunately, good information in English is still rare in Japan, even in times of the World Wide Web.