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You could use the replace asset tool, use a speedboard of your choice or something invisible if you don't want speed signs.
... except that you can leave the entry box for the replacement asset blank and that would remove all instances of the unwanted asset (or assets) from the route (but still leave it in the Trainz database) and replace it with nothing.
It does work because I have used it on a number of occasions to remove an unwanted asset from a route without replacement.
I have to eat my own words here. I just tried it for an object asset using both current and global selection and it did not work. But I am positive that it has worked before - perhaps senility? lack of sobriety? are to blame.
Peter Ware