In Great Britain the Board of Trade requires facing points to be avoided as far as possible; but, of course, they are a necessity at junctions where running lines diverge and at the crossing places which must be provided to enable trains to pass each other on single-track lines.
Two tunnels were built approximately parallel, each taking a single track.
There may be two complete lines of track or three lines of rails, one being common to both tracks, and the cars passing on a middle turnout or " parting "; or a single track with a parting.
In the tail-rope system of haulage, best adapted for single track roads, there are two ropes - a main and a " tail " rope - winding on a pair of drums operated by an engine.
This is truly an idyllic hideaway, accessed by a single track road, the nearest habitation being some distance away.