모노가헬라 레일웨이(Monongahela Railway)
http://en.wikipedia.org/wiki/Monongahela_Railway

기관차
Between 1990 and 1993, eleven class B23-7Rs 4-4 diesel locomotives were purchased from General Electric, remanufactured from former Western Pacific units, numbered 2300-2310.

좀더 자세히 보기
http://blog.daum.net/_blog/BlogView.do?blogid=0IsgZ&articleno=4957811&_bloghome_menu=recenttext#ajax_history_home
http://www.trainnet.org/libraries.html