Hi,
In order to make this work in TS12 you need to first make a new route/map in Trainz, then save it, and exit out of Trainz.
Then, open Content Manager (CM or CMP, not sure what they call it these days) and find your new map.
Right click on it and choose the option open in Explorer.
A new window will pop up on your screen, and that is the folder you save the HOG produced gnd file into, replacing the one already there.
When that is done, just close the window, go back to CM and right click the route/map again and select Commit, or just select it and press Ctrl+M to commit it.
Go back to Trainz and open your map therem, the ground shall now be the HOG produced one.
Hope it helps.
Best of luck.
Linda
