This page from DLW has a pic of a WDP4B locomotive with Hotel load -
click here TKD shed has housed HOG WDP4B's for quite sometime. I believe BGKT too holds a couple of HOG EMD's that were used for trials on JP-JU express.
The same page also has a pic of the WDP4DD locomotive ( though not mentioned there). 40122, the 1000'th EMD produced by DLW has disc brakes and has the designation WDP4DD.