WDG-5 is the COPY version American EMD's.
This is of course the powerful loco in India, but in world, there are others.
EMD DDA40X (1969-1971) holds 6600 HP
GE AC6000CW (1996-2001) holds 6250 HP
EMD...
more... China Railways HXN3 (2008-) holds 6300 HP
WDG-5 Bheem is just a beginning in Indian Railways. There's a lot more way to go ahead.
Its no competitor in front of Allegheny Steam (Extinct) which almost 8000 HP.