Proposed Action: To determine a rail alignment within a rail corridor in which to construct and operate a railroad to transport spent nuclear fuel, high-level radioactive waste, and other materials from an existing railroad in Nevada to a repository at Yucca Mountain, Nye County, Nevada. The Proposed Action includes the construction of railroad construction and operations support facilities. This Rail Alignment EIS analyzes two alternatives that would implement the Proposed Action: the Caliente rail alignment and the Mina rail alignment. This Rail Alignment EIS also analyzes a Shared-Use Option for each implementing alternative, under which DOE would allow commercial shippers to use the rail line for transportation of general freight. No-Action Alternative: DOE would not implement the Proposed Action within the Caliente rail corridor or the Mina rail corridor.