I have discovered I made a mistake writing the readme installation instructions related with one of the Geo´s copy paste.
In the Readme, at the end of the "Installation Instructions" part, I wrote:
QUOTE
Copy the two Geo´s: Headlight_ALT.GeoPcDx and Headlight_Plate.GeoPcDx
Paste them in these two folders:
...\RailWorks\Assets\Jalsina\ATSFchild\NL\Red
and
...\RailWorks\Assets\Jalsina\ATSFchild\NL\Yel
UNQUOTE
The Headlight_Plate.GeoPcDx is required
But, the Headlight_ALT.GeoPcDx is not required.
The right Geo instead is: Headlight.GeoPcDx
I want to thank PNWR1854 for telling me about this bug.