. . . there is no option to add a new path. . . .
Hi.
The only situation I know where the IT (and EIT) editor do not show an option to add a new path is when you are under surveyor mode after running a session in driver mode and switching back to surveyor using the unified driver/surveyor toggle link and the tower you are trying to edit has currently a path active (or activating or canceling). With the new unified driver/surveyor toggle link, only towers with no active path can be edited ; tower with some active paths are no longer editable under surveyor.
This situation can be confirmed by looking at the bottom of the list of paths window for the tower where in such situation there is a line displaying : note : this interlocking tower is currently not editable one or more paths are not clear.
If you have added to your session rules the IT enhanced manager rule, you can also edit the IT enhanced manager rule and in the towers list page, the rule will display for each tower if the tower is currently editable or not.
With the unified driver/surveyor toggle feature, things are now more tricky for towers edition as you can have under surveyor mode some towers with already some active paths (was not possible before in versions anterior to the unified driver/surveyor toggle feature) for which tower edition is no longer authorized to avoid breaking currently active paths using the tower paths editor. This protection is needed to be sure to be able to continue running the current underlying driver session by reusing again the unified driver/surveyor toggle feature to return to driver mode ...
What can you do if however you need to edit the tower and its paths : nothing possible using only the standard N3V tools ...
However if you have added the IT enhanced manager to your rule session and you are using EITs (not possible with standard ITs), you can edit the rule and display the selected tower details page with the list of all its paths. This list will show you which path is active in the tower and for which train. And the rule is smart enough to display also a specific link : make tower editable. If you click on this link, the rule will save all paths current state and then will enforce all active paths to path not set state making this way the tower editable again ... You can now edit the tower and add new paths, ... but avoid breaking any of the initially active paths by modifying any of its paths objects ... Avoid also deleting initially active paths as it will leave some ressources locked with no paths still owning them ... If you only edit the tower to add new paths or modify only paths initially not active it should be fine. When you have finished editing your tower, return to the IT enhanced manager rule to display again the selected tower details page and this time click on the link : restore active paths. The rule will restore the initially active state for all initially active paths in the tower. And if you have not altered any of the initially active paths ressources (essentially path objects) the rule should be able to restore correctly their active state, enabling to continue the underlying driver session using again the unified driver/surveyor mode. If you have altered during the tower edition any of the ressources needed by the active paths, ... anything may happen to the restored active path that may not behave correctly after restoration ... But again if you use this IT enhanced rule advanced feature only to add new paths or to edit paths initially inactive without altering any active paths ressources, you should be able to continue running your underlying driver session with no problems ... But clearly, N3V will never support this feature included only to the IT enhanced manager rule to help edit your uneditable locked towers if you are totally blocked in your session and needs absolutly to edit your locked uneditable tower ... using this feature may have some side effects on your session and you need to know what you are doing ...
It is better after tower edition to go again to the IT enhanced manager rule to explicitly restore the initially active paths as it may show some error information if there are some errors encountered while restoring the active paths. But if you forget to do this restoration, the system will detect you forgot to restore initially active paths when restarting driver mode and will be smart enough to enforce this restoration before restarting driver mode ...
It is also possible using the IT enhanced manager rule while in surveyor mode to cancel initially active paths (and also to cancel path activation delayed requests). And of course explicitly cancelled active paths in surveyor mode, will not be restored when returning to driver mode. Take care that this probably means that a train initially protected on an initially active path by the tower, will now continue its way without any protection from the tower as the path has been canceled during the surveyor mod ...
Again this feature has been designed to only help in some blocked situations where you absolutly need to edit a tower currently not editable, but take care of what you do as you can easily break the logic of your session using this advanced feature ...
Hope my explanations were clear and you understand why by default towers with active paths are protected and not editable. If you need any more explanations or advices on tower edition in such situation, just post a message on this forum or send me a private message for further explanations ...
Regards.
Pierre.