The Berkshire and Eastern Railroad (reporting mark BERX)[1] is a shortline railroad in New England and New York, using tracks owned by Pan Am Southern.

[2][1] Following CSXT's purchase of Pan Am Systems, CSXT and NS chose Genesee & Wyoming (GWI) to operate Pan Am Southern.

GWI, in turn, selected its Pittsburg and Shawmut Railroad (PSR) subsidiary to operate Pan Am Southern.

PSR — doing business as Berkshire & Eastern — will operate, maintain, and market the Pan Am Southern freight rail lines previously operated by Pan Am Railways.

[2] Surface Transportation Board approval of the formation and operation of B&E was contingent on the Board's approval of CSXT's purchase of Pan Am Systems.