Judging from your information, the error is not caused by the deleted road section. As already mentioned, no connection to the road system is established with TrPin ( 0 0 ). According to this, there should only be one pole without verctor lines at the position in question, presumably in blue. But if TSRE crashes during placement, you won't get anywhere with the hack function.
How many hits come up in the rdb with the search pattern for "-12660 14916 726"?
Individual track or road nodes can be removed from the database with TSUTIL and the function 'clrdb'.
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20) Reorganization of databases (track/road) and resources
Function ('clrdb') analyzes track- and road-database and deletes all definition-chains (TrEndNode -
TrVectorNode/TrJunctionNode - TrEndNode), which are no longer used. A definition-chain of nodes is
no more used, if there are NO valid references from world- or sound-objects to this chain. This
situation may exist, if world-objects or total world-files have been deleted.
Or you can delete them manually and use "rendb" to restore them by numbering.
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13) Modify track-database "*.tdb"/"*.rdb" and delete gaps
After manual delete of (defective) Track-Nodes from track-/road-database *.tdb/*.rdb, this function
('rendb') can repair references and dependencies within the databases. All Nodes are
'shifted together' and references are updated. It is checked, if there are invalid references
which cannot be reestablished. These references are logged and replaced by '0'.
TrItem-Definitions are renumbered, too. All gaps are deleted. If specified, TrItem-Definitions,
which are no longer referenced from world-files or Track-Nodes, are also deleted. All references
are updated.
However, these are complicated processes. I would have to have the track itself to try this out.
Sorry that I can't help here...