Are there many examples of standard gauge lines in Great Britain which are totally disconnected from the main network? The one which springs to mind is the Island Line for obvious reasons. Is there a theoretical possibility of a standard gauge vehicle* travelling every inch of track without having to be lifted off the rails , or are there lines which are physically separate? For example, the Waterloo and City Line – does that have a running connection to the main line anywhere, however circuitous? What about other Tube lines, or heritage railways?
*assuming it's small enough to meet the smallest loading gauge such as the tube lines, and not dependent on a particular power supply.
*assuming it's small enough to meet the smallest loading gauge such as the tube lines, and not dependent on a particular power supply.