A very interesting debate. The idear of the circle line is a good one, but looking at it historically is doomed to fail. The grand plans of merseyrail in the 60's/70's were for the loop, link, spur. Electric lines to Wigan, Warrington & Chester. North loop via Bootle & west derby, south loop via Belle vale. What happened to these grand plans? The country's financial troubles in the 70's, & a millitant work force, driving up the costs, put paid to most of them. what was built was cut to the bone. such as the escalator at lime st stoping short of the platform to save £100.000. With this global credit crunch and rising costs all round, are we likely to see this the circle line ever built? I have my doubts the proposed Anfield, north mersey re opening or Burscough curves will get of the ground . But you never know , miracle's do happen..