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.
A short cervical length between 20 weeks and 24 weeks is the best predictor of preterm birth: Length less than 1 cm: Mean birth gestational age 32 weeks. Length less than 1.5 cm: Mean birth gestational age 33 weeks. Length less than 2 cm: Mean birth gestational age 34 weeks.