As per wikipedia
The following variants are built from the WAG-9:
WAG-9: Original version
WAG-9H: Heavy version with additional ballast, total weight: 132 t
WAG-9i:...
more... Version with IGBT Technology
WAG-9Hi: Version with additional ballast and IGBT Technology
WAG-9HC: Heavy version with Conventional Brake Rigging
WAG-9HH: Heavy Version with High Horsepower 9000 hp variant