#Know_your_Locomotives
WDP4 - 4000 Hp Passenger Locomotives
State-of-Art, Microprocessor controlled AC-AC, Passenger Locomotive Powered with 16-710G3B 4000HP Turbo charged Two stroke Engine.
Fabricated rigid design Under frame, two stage suspension, High Traction High Speed 3 axle (HTSC) light weight cast truck frame attribute to high adhesion performance.
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turned out in 2003, this locomotive has exceptional fuel efficiency and very low maintenance requirements. It is specifically designed for heavy haul passenger traffic requirements for Indian Railways
The WDP4 fleet is being upgraded by provision of hotel load feature along with power upgradation to 4500 HP. The prototype will be manufactured in the year 2007.
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#Diesel_Engine
16 Cylinder 710 G3B, 2 stroke, turbocharged after cooled
Fuel Efficient Engine
Injection System Direct Unit Injector
Governor Woodward
Compression Ratio- 16:1
Lube Oil Sump Capacity - 1073 Lts
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#Transmission
Electrical AC-AC
4 Traction motor ( 3 in parallel per bogie)
Suspension - Axle hung / taper roller bearing
Gear Ratio - 77:17
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Truck
High adhesion HTSC ( High Tensile Steel Cast) truck or bogie
Adhesion - 0.42
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#Brakes
Electronic Air Brake System ( KNORR-NYAB-Computer Controlled Braking)
Air , hand , dynamic brake with fully blended with automatic brakes
Pure air brake
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#General_Characteristics
Installed Power - 4000 Hp
Axle Load - 19.5 T
Gauge - 1676 mm
Wheel arrangement - A-A-I I-A-A
Wheel diameter - 1092 mm
Height - 4201mm
Width - 3127 mm
Overall Length (Over Buffer Beam) - 19964 mm
Weight - 117 T
Max tractive effort - 27 T
Maximum speed - 180 Kmph
Fuel tank capacity - 4000 lts
Locomotive Control - EM 2000 with SIBAS-16 Traction Control
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Pics - Mandovi Exp hauled with WDP 4 (all pics)

#Know_your_Locomotive
WDP-4B - 4500 Hp Passenger Loco
The EMD GT46PAC 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 (DLW) of Varanasi, India for Indian Railways as their classes WDP-4, WDP-4B and WDP-4D. The GT46PAC is a passenger version of the previous Indian Railways EMD GT46MAC freight locomotive. The locomotive has a 16 cylinder 710G3B diesel engine with a maximum speed of 904 RPM.
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are three variants of this loco - the original WDP-4 which is a 4,000 hp (2,980 kW) loco, the WDP-4B which is a 4,500 hp (3,360 kW)126 t (124 long tons; 139 short tons) weighted loco with a single cab and the newest WDP-4D which is a 4,500 hp (3,360 kW) loco with dual cabs.
These locos are modified versions of the WDG-4 class locos, used for passenger operations. They have a reduced axle load of 20.2t (compared to the WDG-4's 21t axle load), achieved mainly by trimming the weight of the underframe. The gear ratio is 17:77, horsepower rating of 4500hp (brake horsepower 4150hp), and the maximum tractive effort is 384.4kN. It has an operational design speed of 130km/h and a maximum speed of 150km/h. The cab is slightly wider to provide better visibility when running long hood forward. All other features are essentially the same as with the WDG-4. Please see the WDG-4 class information for more details on this loco.
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#Performance
The WDP-4B is capable of hauling 24 coach trains at 115–120 km/hour. Irs Variant WDP4 has also been used for speed trials where it has hauled 8 coach trains at 160 km/hour.
The locomotives can be used in either direction, and frequently haul trains long hood forward, as in the picture. Newer editions with 4500 hp have been produced which have been named with the sub class WDP-4B /WDP-4D which have different traction control with six traction motors and are Co-Co bogie equipped (more similar to WDG-4), unlike the original which has a Bo-1-1-Bo arrangement with four traction motors. Due to some controversies regarding visibility hindrances faced by loco pilots in driving long hood front, the basic WDP-4B model has been modified to dual cab to eliminate any such possibility. Other features of WDP-4B and WDP-4D are same. The cabs have a slightly wider profiles, to improve visibility.
Some of the WDP-4B/WDP-4D are spotted having provision for an inverter-driven head-end power unit, allowing running trains without a generating car (EOG) for hotel power.
The loco is very fuel efficient and has minimal exhaust emissions unlike ALCO based locomotives, thanks to its its 2 stroke high efficiency diesel engine. It is characterized by its loud horn, which can be heard for large distances around, and aircraft-like sound of its running engine.
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#Criticism
The use of the locomotives "long hood forward" has been criticised because the driver might have difficulty in seeing signals. This criticism has been rejected by Indian Railways.[1] But the solution to this problem is to upgrade all WDP-4 and WDP-4B models from single cabins to WDP-4D models of dual cabins. Older locomotives of Indian Railways like the WDM-2 models have been upgraded from WDM-2 series to WDM-3 and WDM-3A series, to enhance other kinds shortcomings in design of WDM-2 series.
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#Diesel_Engine
16 Cylinder 710 G3B, 2 stroke, turbocharged after cooled
Fuel Efficient Engine
Injection System Direct Unit Injector
Governor Woodward
Compression Ratio- 16:1
Lube Oil Sump Capacity 950 Lts
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#Transmission
Electrical AC-AC
6 Traction motor ( 3 in parallel per bogie)
Suspension Axle hung / taper roller bearing
Gear Ratio 90:17
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#Brakes
Electronic Air Brake System ( KNORR-NYAB-Computer Controlled Braking)
Air , hand , dynamic brake
Pure air brake
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#General_Characteristics
Installed Power 4500 HP
Axle load 20.2 T
Gauge 1676 mm
Wheel arrangement Co-Co
Wheel diameter 1092 mm
Height 4201 mm
Width 3127 mm
Overall Length (Over Buffer Beam) 19964 mm
Maximum Speed 130-150 Km/hr
Weight 126 T
Fuel tank capacity 6000 lts
Gear ratio is 17:77
Locomotives made by DLW Varanasi
Pic:- WDP 4B hauled with Mandovi Express (both pics)

#Know_Your_Loco
WDG4 - 4000 HP GOODS LOCOMOTIVE
Broad Gauge freight traffic Co-Co diesel electric locomotive with 16 Cylinder 4000 HP engine, AC-AC transmission, microprocessor controlled propulsion and braking with high traction high speed cast steel trucks.
First turned out in 1999 with transfer of technology from General Motor (USA), this locomotive has exceptional fuel efficiency and very low maintenance requirements. It is...
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specifically designed for heavy haul freight traffic requirements of Indian Railways for the 21st Century.

The heart of loco Traction Control Converter uses the GTO devices (obsolete technology). Now the IGBT devices, has been introduced from Oct 2006. It is the latest technology and will be cost effective and gives higher reliability.
The locomotive power has been upgraded to 4500 BCV and the first Loco (Loco No 12114) was manufactured in May 07
#Diese_Engine
16 Cylinder 710 G3B, 2 stroke, turbocharged after cooled
Fuel Efficient Engine
Injection System Direct Unit Injector
Governor Woodward
Compression Ratio- 16:1
Lube Oil Sump Capacity 950 Lts
#Transmission
Electrical AC-AC
6 Traction motor ( 3 in parallel per bogie)
Suspension Axle hung / taper roller bearing
Gear Ratio 90:17
#Truck
High adhesion HTSC ( High Tensile Steel Cast) truck of bogie
Adhesion 0.42
#Brakes
Electronic Air Brake System ( KNORR-NYAB-Computer Controlled Braking)
Air , hand , dynamic brake
Pure air brake
#General_Characteristic
Installed Power 4000 HP
Axle Load 21 T
Gauge 1676 mm
Wheel arrangement Co-Co
Wheel diameter 1092 mm
Height 4201 mm
Width 3127 mm
Overall Length (Over Buffer Beam) 19964 mm
Weight 126 T
Max tractive effort 54 T
Maximum speed 100 kmph
Fuel tank capacity 6000 lts
Locomotive Control EM 2000 with SIBAS-16 Traction Control
Pic 1 WDG4-4000 HP GOODS LOCOMOTIVE
Pic 2 TRACTIVE EFFORT & POWER CHART
Source click here