Key:tensioning
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Specifies the type of tensioner on a catenary mast 
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| Requires |
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Specifies the type of tensioner on a power=catenary_mast.
Description
The overhead contact line does not consist of a single contact wire that runs from the start to the end of the line, but is divided into sections that are up to approx. 1.5 kilometres long. This is for static reasons, as the overhead contact line should always have the same tension, but the length of the overhead contact line (material: copper) changes with the temperature. In addition to their function of holding the overhead contact line, some catenary masts have additional tasks. Some have the task of an overhead contact line section that is coming to an end.
How to map
Add =* to a power=catenary_mast. The following values are typical:
| Feature | Key | Value | Description | Photos |
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| type of tensioning of the overhead contact line | |
weights |
Tensioning the overhead contact line with weights |
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hydraulic |
Hydraulic assemblies | |||
spring |
spring | 
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coil |
coiled leaf spring | 
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fixed |
no tensioning device, overhead contact line is firmly attached to the catenary mast | 
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yes |
if unclear which type of tensioning present or nothing else fits |