Critical Infrastructure
- World War I - A detachment of the 9th Regiment National Guard arrived in April 1917 to guard the viaduct from sabotage, via sentry duty.
- World War II - Canton's Civil Defense Corps and railroad employees guarded the viaduct against sabotage since the train line is part of the direct link between Boston and New York City. The structure is a critical transportation link between the two cities and had extra protection as a result.
- War on Terrorism - Shortly after the terrorist attacks of September 11, 2001 the Canton Viaduct was guarded by various security entities until the U.S. threat level decreased.
In a letter to Canton's Board of Selectmen on February 27, 2002, former Police Chief Peter Bright noted that Massachusetts Emergency Management Agency training for worst-case situations highlights the destruction of the Canton Viaduct for its disruption of the national railroad system; the Federal Government also considers the viaduct a high-risk target.
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“Good critical writing is measured by the perception and evaluation of the subject; bad critical writing by the necessity of maintaining the professional standing of the critic.”
—Raymond Chandler (1888–1959)