Catenary systems can have three different types of links, these are to:

• In Spans - This is a list of all the in spans that can be used with the catenary system
• Wire Supports - This is a list of all the wire supports that can be used with the catenary system
• Brackets (Bracket Slots) - This is a list of all the bracket slots that can be used with the catenary system, if a bracket slot is not linked to the catenary system, then no equipment can be placed with the catenary system using the slot