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 Вверху: UBL WDP4 20005 в режиме Cab Forward
Внизу: KJM WDP4 20044 в режиме Hood Forward. | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Если не указано иное, данные взяты из книг диаграмм RDSO, приведенных в справочниках. | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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 Banaras Locomotive Works (BLW) of Varanasi, India for Indian Railways as the classes WDP4, WDP4B and WDP4D.[1] 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.[2]
Варианты [ править ]
Существует три варианта этого локомотива: оригинальный WDP-4, который представляет собой локомотив мощностью 4000 л.с. (2980 кВт), WDP-4B, взвешенный локомотив мощностью 121,2 т (119,3 длинных тонн; 133,6 коротких тонны) на 4500 л.с. с одной кабиной и новейшим локомотивом WDP-4D, который представляет собой локомотив мощностью 4500 л.с. (3360 кВт) с двумя кабинами. [3]
WDP-4[edit]
The WDP-4 was the loco originally designed by GM EMD and 10 of them were dispatched to India by June 2001. Later on Banaras Locomotive Works, Varanasi started building them initially using knocked-down kits and later indigenously. 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.[4]
Visibility Issue[edit]
Использование локомотива с удлиненной передней конфигурацией капота подверглось критике в связи с ухудшением обзора для машиниста, поскольку на него влияет выступающая секция радиатора в конце капота. Эта критика была отвергнута РЖД. [5] Однако, в ответ, профиль кабины некоторых WDP-4 был расширен, чтобы увеличить поле обзора из кабины управления, и вариант WDP-4B также был произведен с таким же расширенным профилем кабины.
WDP-4B [ править ]
This was the first attempt of the Railways to improve upon the successful WDP-4 locomotive. The Bo1-Bo was found inadequate for hauling 24 coach passenger trains due to the reduced tractive effort. As a result, DLW, reconfigured the chassis to be Co-Co instead. This led to better adhesion with the rails to provide better acceleration with heavy trains. Moreover, the original EMD 710 engine was tweaked to produce an output of 4,500 HP instead of the original 4,000 HP. One more important change added to this loco was the inclusion of Blended Brake System. This was added to maximise the use of Dynamic brakes by the loco-pilot and therefore minimise the wear and tear on the fixed brake rigging of the coaches and the locomotive. The addition of blended brake is responsible for the subclass to be designated with a 'B'. Some more features are the widening of the cab profile to aid visibility, change in the Traction Motor blower by installing a higher power motor and increase in the axle load to 20.2 tonnes (19.9 long tons; 22.3 short tons). The locomotive also has a self load test feature that allows it to test the net output of the engine. In Siemens and EMD systems, the loco has been provided with 2 traction inverters (TCC-1 and TCC-2, for the respective bogies) while in the Medha system, it has 6 traction inverters, one for each traction motor.[6]
WDP-4D[edit]
The final alterations to the GT46PAC came in the form of the WDP-4D. The locomotive is the most distinctively identifiable of the three thanks to the addition of a second cab at the long hood end of the locomotive. Due to the heat generated from the radiator at the second cab end of the locomotive, DLW had to install air conditioning to protect both the electrical components and the loco-pilot from the high temperatures. The existing features from WDP-4B have been carried forward to this class and it exclusively features the widened cab profile. The loco features a completely different desk control stand, provided by Medha with digital display screens allowing for remote fault diagnostics. Many locos also have GSM-R based transmission antennae to transmit critical loco info for use by maintenance and signalling staff. It features electro-pnuematic microprocessor based control adapted from the WDP-4B and brake system equipment of KNORR/NYAB CCB type.[7]
Road number[edit]
The locomotives are numbered from No. 20000 upwards till 20103 and further numbering of the loco along with its WDP-4B/4D variants is from 40001 up until 40608. The jump in the numbering is due to the 20XXX series almost breaching the start of the numbering of another locomotive class, the WCG-2 which is a DC electric locomotive whose numbering started from 20105.[8]
Builders[edit]
The first set of 10 locos starting from road number 20000 to 20009 were manufactured by the Electro Motive Diesel (EMD) of (General Motors) while road numbers 20011 upwards have been manufactured by Banaras Locomotive Works (DLW) of Varanasi in collaboration with GM (General motors). Siemens and Medha are part of this group providing a large number of components of the electronics on board this loco such as the control stand and traction inverters.[9] Additional components are acquired through tenders and a bidding process.
Locomotive sheds[edit]
| Zone | Name | Shed Code | Quantity |
|---|---|---|---|
| Central Railway | Pune | PA | 36 |
| Kalyan | KYN | 14 | |
| Eastern Railway | Howrah | HWH | 16 |
| Andal | UDL | 2 | |
| Northern Railway | Tughlakabad | TKD | 52 |
| Ludhiana | LDH | 22 | |
| Lucknow | LKO | 10 | |
| North Central Railway | Jhansi | JHS | 14 |
| North Eastern Railway | Gonda | GD | 7 |
| Izzatnagar | IZN | 28 | |
| Northeast Frontier Railway | Guwahati | NGC | 10 |
| Siliguri | SGUJ | 81 | |
| North Western Railway | Bhagat Ki Kothi | BGKT | 75 |
| Abu Road | ABR | 6 | |
| Southern Railway | Erode | ED | 19 |
| Ernakulam | ERS | 12 | |
| Golden Rock | GOC | 24 | |
| South Central Railway | Gooty | GY | 40 |
| South East Central Railway | Raipur | R | 7 |
| South Western Railway | Krishnarajapuram | KJM | 111 |
| Hubli | UBL | 48 | |
| Western Railway | Sabarmati | SBT | 29 |
| West Central Railway | Itarsi | ET | 47 |
| Total Locomotives Active as of 01-11-2020[10] | 710 | ||
Gallery[edit]
WDAP-5 Dual Mode Locomotive[edit]
Indian Railway was planning for a dual mode locomotive from 2015. In 2019 Banaras Locomotive Works Varanasi, RDSO and CLW together have got the successes of producing a new class of dual mode locomotive named WDAP-5 which can run on both diesel and electric. The design of the locomotive is based on WDP-4D and the bogies were taken from WDG-5. It has been designed for a speed capable of 135kmph. It will produce 4500Hp in diesel mode and 5500Hp in electric mode. Fuel tank capacity 3000 liters which is half than WDP-4 due to weight saving. Only 1 unit has been produced till now and it is in trial with RDSO.
See also[edit]
- Indian locomotive class WDG-4
- List of diesel locomotives of India
- Indian Railways
- Rail transport in India
References[edit]
- ^ http://www.dlw.indianrailways.gov.in/view_section.jsp?lang=0&id=0,295,329,389,391
- ^ "Details from production Factory".
- ^ "IRFCA".
- ^ Introduction Handbook on GM Locomotive (PDF). IR CAMTECH. 2006.
- ^ "Railway claims engine design not faulty". News18. 2010-06-15. Retrieved 2020-05-15.
- ^ RDSO diagram book for WDP-4B (PDF). Railway Design and Standards Organisation. 2014. p. 5.
- ^ WDP4D diagram book (PDF). Railway Design and Standards Organisation. 2016. p. 12.
- ^ "IRFCA".
- ^ "DLW site".
- ^ "Railway Website Mechanical Department". Retrieved 16 May 2020.
External links[edit]
 | Wikimedia Commons has media related to EMD GT46PAC locomotives. |
- EMD specification
- Autocar India has a detailed profile of the WDG-4 locomotive.
- Diesel loco specification at IRFCA website
- Detailed Specifications for the WDP4D
- Detailed Specifications for the WDP4B
- Traction Motor Specifications and Model Numbers
