page_title: Indian locomotive class WDP-4
section_title: WDP-4
hierarchical_section_title: Indian locomotive class WDP-4 / Variants / WDP-4
caption_attribution_description: English: Siliguri diesel locomotive shed based EMD 20081 of Indian railways. Location - Katihar, Bihar (India)
context_page_description: The EMD GT46PAC or WDP4 is a passenger-hauling diesel-electric locomotive with AC electric transmission designed by General Motors Electro-Motive Division and built by both GM-EMD and under license by Diesel Locomotive Works of Varanasi, India for Indian Railways as the classes WDP4, WDP4B and WDP4D. The GT46PAC is a passenger version of the previous Indian Railways EMD GT46MAC freight locomotive. The locomotive has a 16-cylinder 710G3B diesel engine and is one of the fastest diesel-electric locomotives in service in Indian Railways.
context_section_description: The WDP-4 was the loco originally designed by GM EMD and 10 of them were dispatched to India by June 2001. Later on Diesel Locomotive Works, Varanasi started building them initially using knocked-down kits and later indegeniously. Starting 2003, the locomotives were produced in large numbers by DLW. The locomotive features self diagnostics control using EM2000 onboard microprocessor which was a new technology for Indian Railways back then.
  Unlike the Co-Co wheel arrangement featured on most locomotives, including its freight hauling variant, WDG-4, this loco has a Bo1-1Bo wheel arrangement meaning that it has two powered and one unpowered axle per bogie. This was done to reduce the weight of the loco to make it suitable for passenger operations and also to reduce maintenance.
caption: SGUJ based WDP4 20081 at Katihar
exif: {"Image ImageWidth": "4573", "Image ImageLength": "2112", "Image ExifOffset": "62", "Image Orientation": "Horizontal (normal)", "EXIF FocalLength": "181/50", "EXIF ExposureTime": "1/100", "EXIF ISOSpeedRatings": "154", "EXIF Flash": "Flash did not fire", "EXIF FNumber": "9/5", "EXIF LightSource": "Unknown"}