Without a more precise problem description I can only give general advice. Certain words in your posts suggest that this might be about placement of UTM tiles and the pop-up warning message that the corresponding baseboards were not found and therefore some UTM tiles were skipped.
UTM tiles are ordinary Trainz assets, like houses or trees, only much bigger. To place them, they need the matching baseboard already existing in the route. Trainz baseboards are 720 x 720m, while UTM tiles are 1000 x 1000m (or 4 tiles of 500 x 500m). So, if you export DEM and ground textures along a path, make sure to create enough width on either side, by setting the Route Filter to the desired number of baseboards. If you then export UTM tiles to that route, set that Route Filter to a reasonable value as well. As a rule of thumb use the arithmetic calculation, e.g. with terrain route filter set to 3 baseboards = 2160m - 2880m, UTM tile route filter 2 would be 2000 - 3000m but will probably miss a few at the edges.
As a visual aid in TransDEM, switch on the baseboard grid and set the UTM grid to 1000m fix.
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