Creating rail road texture for CFS2

I am attempting to use Ground2K V4 to make railroads for CFS2 by substituting a custom texture. The texture shows up but does not look correct unless the VTP1 line is straight north/south. If the line runs east/west it appears that the image used is a horizontal strip across the texture. If I use the stock texture, all is well. What is the method for creating a texture that CFS2 will treat like its road texture? I used an 8 b8t mipped texture with alpha channel. Any help is appreciated.