Pan Am Railways (PAR), known as Guilford Rail System (GRS) before March 2006, is a Class 2 railroad covering northern New England from Mattawamkeag, Maine to Rotterdam Junction, New York. The primary subsidiaries of PAR are the Maine Central Railroad (MEC), the Boston and Maine Railroad (BM), and Springfield Terminal Railway (ST). PAR is a subsidiary of Pan Am Systems, formerly known as Guilford Transportation Industries (GTI). Wikipedia
The definitive Wikipedia entry for Pan Am Railways. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Pan_Am_Railways