WDP4
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| Type and origin | |
|---|---|
| Power type | Diesel-electric |
| Builder | EMD & DLW |
| Model | GT46PAC |
| Build date | (EMD) 2001 (DLW) 2003–Present |
| Total produced | (EMD) 10 (DLW) 170+ under license (in production) |
| Specifications | |
|---|---|
| AAR wheel arr. | B1-1B (WDP-4), C-C (WDP-4B/4D) |
| Gauge | 5 ft 6 in (1,676 mm) |
| Trucks | HTSC |
| Bogies |
|
| Fuel type | Diesel fuel |
| Fuel capacity | 1,600 US gal (1,300 imp gal; 6,100 L) |
| Prime mover | 16-710G3B |
| Engine type | 2-stroke V16 diesel |
| Aspiration | turbocharged |
| Displacement | 11,360 cu in (186.2 L) |
| Alternator | TA-17-CA6A AC, 1 inverter per truck |
| Cylinders | 16 |
| Transmission | Diesel electric |
| Loco brake | Air |
| Train brakes | Air |
| Performance figures | |
|---|---|
| Power output |
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| Career | |
|---|---|
| Operators | Indian Railways |
| Locale | India |
The EMD GT46PAC or WDP-4 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.
There 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.
The locomotives are numbered from Road No. 20000 upwards till 20103 and further numbering of the loco along with its WDP-4B/4D variants has started from the 40XXX series. This is due to the numbering of the 20XXX series almost breaching the start of numbering of another locomotive class, the WCG-2 which is a DC electric locomotive whose numbering started from 20105.
The WDP-4 is capable of hauling 24 coach trains at 110–120 km/h (68–75 mph). It has been also used for Spanish Talgo trial run at speed of 180km/h.
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 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. The other features of the WDP-4B and the WDP-4D are the same. The newer cabs have slightly wider profiles to improve visibility.
Some of the WDP-4B/WDP-4D locomotives have been spotted having a provision for an inverter-driven head-end power unit which allows trains to be run without an End-on generating car (EOG) for hotel power.
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Wikipedia