Transcontinental railroads in and near the United States (1887). A transcontinental railroad is a contiguous network of railroad trackage that crosses a continental land mass with terminals at different oceans or continental borders.
Normal cervical range of motion is. 1  Flexion â 80 to 90 degrees. 2  Extension â 70 degrees. 3  Lateral flexion â 20 to 45 degrees on both sides.  Rotation â 90Â° of rotation to both sides.
Lateral (side) cervical x-ray (above) reveals disc space narrowing and osteophyte (bone spur) formation. Notice how straight the neck is. Degeneration causes the loss of normal neck curvature. This patientâs head thrusts forward and is in poor alignment.