Reply To: The dreaded Terrain Alignment Error

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This sort of thing happens when the land under the second track is not deep enough for the tunnel, even though the land under the first track is. One solution is before you draw your first tunnel, attempt to draw another tunnel one track-width to the left or right to see if it can be done. If the tunnel-portals are in different places, you may have to massage your terrain so the two tunnels would start and end at roughly the same place (but this is impossible if the tunnel consists of more than one segment that does not have the same curvature/gradient as the rest). It would be nice if building a tunnel could terraform land upwards (and we could manually move the portal along the track when building) – nicer still if we had a double-track building mode (this would also allow us to build double-track bridges with the pillars in the right places, and also solve a whole lot of other problems).