challenge: Where was the Uxbridge Vine Street railway station located in relation to the main line at West Drayton?
  
  A. It was the northern terminus of the Great Western Railway's Uxbridge branch
  B. It was the southern terminus of the Great Western Railway's Uxbridge branch
  C. It was a midpoint station on the Great Western Railway's Uxbridge branch
  D. It was a separate line not connected to the Great Western Railway's main line
  Answer: 