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.
This increase is due to rapid brain growth. The average head circumference at birth is about 13.5 in. (34.5 cm) . By the end of the first month, it increases to about 15 in. (37.6 cm) .