I am running Trainz 2006.
I am using the Coal Stage by Vulcan, kuid 60238:38169. In his readme file he gives instruction on how to convert it to a gravel or rock stage as follows: "While the contents are coal you may replace the texture file for some other materials. I have included a file for gravel and one for rocks that you may use. Just delete the coal.tga file and rename the gravel.tga or the rock.tga to coal.tga. Keep a copy of the original files if you need go back to the original or reinstall the .cdp file."
I have done this, but it still shows up as coal. Any helpful suggestions ?

I am using the Coal Stage by Vulcan, kuid 60238:38169. In his readme file he gives instruction on how to convert it to a gravel or rock stage as follows: "While the contents are coal you may replace the texture file for some other materials. I have included a file for gravel and one for rocks that you may use. Just delete the coal.tga file and rename the gravel.tga or the rock.tga to coal.tga. Keep a copy of the original files if you need go back to the original or reinstall the .cdp file."
I have done this, but it still shows up as coal. Any helpful suggestions ?