Multispan skylines are best suited for downhill yarding. Uphill yardingmay be accomplishe dif the angle across the intermediate support is not too great. If there is slack in the lower span, the loaded carriage has trouble riding up and over the intermediate support.
The carriage must have open-sided sheaves so as to pass the intermediate support Production with multispan skylines is usually lower due to the lower line speeds required for passing the intermediate supports. A schematic of this system is shown below.
