Here are some quotes from the ERVING paper company's centennial history on the discontinuation of rail service. The full Centennial Book can be found here:
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"Rail service in Erving had become problematic. In 1972, ERVING officials attended hearings in Boston before the Interstate Commerce Commission to object to plans by the beleaguered Boston & Maine (B&M) Railroad to discontinue freight service from Ayer, Massachusetts, to Rotterdam Junction, New York. The employee newsletter worried, “We could not hope to survive in this very competitive industry if this rail service were abandoned. Your company handled some 3,900 cars in 1971 and is the largest single user of the B&M on this western line.”"
"When the B&M went through bankruptcy and the Penn Central was put in control, the service on the railroad was discontinued....Guilford’s
freight trains clickety-clack their way by the ERVING plant, but are no longer of use to the company."