The New Zealand Railways Magazine, Volume 1, Issue 10 (March 21, 1927)
Increased Capacity
Increased Capacity.
For unidirectional traffic the capacity of the line is increased perhaps tenfold where long or slow sections exist between crossing stations. For two way traffic on single lines the system permits with safety of unattended crossing loops and, at comparatively small annual cost, doubles or trebles the volume of traffic previously possible.