Efforts to preserve rail corridors or restore rail service to dormant rail alignments across the United States are very uneven. A handful of states have aggressive, well-funded programs to support the preservation or reuse of rail alignments; more states have modest programs to support short line operations on a case-by-case basis, but attach no value to corridor retention per se. In 2005, California completed what is perhaps the nations most comprehensive physical plant inventory of active and abandoned rail corridors; a review driven by interest in passenger rail and nonmotorized corridor interests. A foundation has been set to more fully lever these valuable alignments in this country's most populous state. This synthesis was undertaken to document current practices with respect to rail corridor preservation. State departments of transportation (DOTs), selected metropolitan planning organizations, commuter rail agencies, short line holding companies, and Class I rail carriers were all surveyed for information. Response rates to the survey were moderate, averaging 24%, and overall supporting the notion that preservation of rail alignments is not a high-priority issue in many jurisdictions. A handful of state respondents, however, had a great deal of experience and valuable observations on rail preservation policies and could be said to have become experts on this subject through their dealings with several dozen rail corridors over the past two decades. North Carolina, Ohio, and Pennsylvania DOTs each have serious, well-established rail sections and a history of successful preservation efforts.