please provide troubleshooting guide of wdg4 and wdp4 locomotives.

The keys to successful motor operation include a total understanding of the application, then choosing the proper type of motor for the application. This must then be followed by the proper installation – mounting, coupling, and a total understanding of the motor surroundings or environment. Of course, for continued success proper maintenance of the motor must also be performed. Many problems could be avoided if the application and environment were understood, while others may be caused by a changing environment in which the motor operates. In addition, some are due to choosing the wrong motor for the application or defects within the motor itself. This paper examines the most common mechanically or electrically originated motor problems and their preventative action.

more reference at :
http://uiccdrom/2008/02_globalview_india2/presentations/11.Vision2025_locomotives.pdf