Janamkatha: added references

2026-03-28T02:53:26Z

added references

Ajendra69: Created page with "{{Short description|Passenger-hauling diesel-electric locomotive with AC electric transmission}} {{more citations needed|date=October 2015}} {{Infobox locomotive | name = WDP-4 | powertype = Diesel-electric | image = EMD-GT46PAC-WDP4.jpg | caption =
Top: UBL WDP4 20005 in Cab Forward mode Below: KJM WDP4 20044 in Hood Forward mode.
| builder = EMD & BLW | serialnumber = | buildmodel = List of EM..."

2022-05-30T04:13:45Z

Created page with "{{Short description|Passenger-hauling diesel-electric locomotive with AC electric transmission}} {{more citations needed|date=October 2015}} {{Infobox locomotive | name = WDP-4 | powertype = Diesel-electric | image = EMD-GT46PAC-WDP4.jpg | caption = <div> *Top: UBL WDP4 20005 in Cab Forward mode *Below: KJM WDP4 20044 in Hood Forward mode. </div> | builder = EMD & BLW | serialnumber = | buildmodel = List of EM..."

New page

{{Short description|Passenger-hauling diesel-electric locomotive with AC electric transmission}}
{{more citations needed|date=October 2015}}
{{Infobox locomotive
| name = WDP-4
| powertype = [[Diesel-electric]]
| image = EMD-GT46PAC-WDP4.jpg
| caption = <div>
*Top: UBL WDP4 20005 in Cab Forward mode
*Below: KJM WDP4 20044 in Hood Forward mode.
</div>
| builder = [[Electro-Motive Diesel|EMD]] & [[Banaras Locomotive Works|BLW]]
| serialnumber =
| buildmodel = [[List of EMD locomotives|GT46PAC]]
| builddate = (EMD) 2001<br /> (DLW) 2003-2010
| totalproduction = '''WDP-4:''' 100<br />'''WDP-4B:''' 86<br />'''WDP-4D:''' 525 Under License (Production has stopped)
| uicclass = Co-Co
| gauge = {{track gauge|5ft6in|lk=on}}
| trucks = high adhesion HTSC (High Tensile Steel Cast)
| wheeldiameter = {{convert|1092|mm|in|abbr=on|lk=in}}
| axleload = '''WDP-4''' : {{convert|19.5|t|LT ST|abbr=on|lk=in}}<br />'''WDP4B''' : {{convert|20.2|t|LT ST|abbr=on|lk=in}}<br />'''WDP4D''' : {{convert|20.5|t|LT ST|abbr=on|lk=in}}
| locoweight = '''WDP4''' : {{convert|115.8|t|LT ST|abbr=on|lk=in}}<br />'''WDP4B''' : {{convert|121.2|t|LT ST|abbr=on|lk=in}}<br />'''WDP4D''' : {{convert|123|t|LT ST|abbr=on|lk=in}}
| fueltype = [[Diesel fuel]]
| fuelcap = {{convert|5,000 - 6,100|L|impgal USgal|abbr=on|lk=in}}
| primemover = [[EMD 710|16-710G3B]]
| rpmrange = 200 - 954 rpm
| rpmrange low = 200 rpm
| rpmrange idle = 269 rpm
| rpmrange max = 954 rpm
| enginetype = [[Two-stroke engine|2-stroke]] [[V16 engine|V16]] [[Diesel engine|diesel]]
| displacement = {{convert|186.16|L|cuin|abbr=on}}
| aspiration = [[Turbocharger|turbocharged]]
| alternator = '''WDP4 / WDP4B''' : GM TA-17 (main) with CA-6B (companion)<br />'''WDP4D''' : EMD TA-17 (main) with C6AB (companion) or BHEL TA 9901 (main) with AA 9201 (companion)
| tractionmotors = '''WDP4''' : Siemens 1TB – 2622 - 0TB02 <br />'''WDP4B''' : Siemens 1TB-2622-0TA02 or EMD A 2916-8 <br />'''WDP4D''' : Siemens 1TB2525 –0TA02 or EMD A 2916-8
| t/m amps cont = 1250 Amps DC
| cylindercount = 16
| transmission = [[Diesel-electric transmission|AC Electric]]
| gear ratio = 17:77
| poweroutput = <div>
*{{convert|4,000|hp|kW|-1|abbr=on}} (WDP4)
*{{convert|4500|hp|kW|-1|abbr=on}} (WDP4B and WDP4D)
</div>
| tractiveeffort = '''WDP-4''' : {{convert|27550|kgf|kN|abbr=on}}
'''WDP-4B''' : {{convert|40775|kgf|kN|abbr=on}}
'''WDP-4D''' : {{convert|40788|kgf|kN|abbr=on}}
| maxspeed = '''WDP-4''' :<br /> Service : {{convert|160|km/h|mph|abbr=on}}<br /> Testing : {{convert|180|km/h|mph|abbr=on}}<br />
'''WDP-4B''' : {{convert|130|km/h|mph|abbr=on}}<br />
'''WDP-4D''' : {{convert|135|km/h|mph|abbr=on}}
| locobrakes = [[Railway air brake|Air]], Handbrake, Blended (not in WDP4), [[Dynamic brake]]
| trainbrakes = [[Railway air brake|Graduated Release Twin Pipe Air Brakes]] (IRAB-1 Compatible)
| operator = [[Indian Railways]]
| fleetnumbers = '''20000 - 20103''', '''40001 - 40608'''
| locale = [[India]]
| notes = Unless specified otherwise, data is obtained from RDSO diagram books, given in references.
}}

The '''EMD GT46PAC''' or '''WDP4''' is a passenger-hauling [[diesel-electric locomotive]] with AC electric transmission designed by [[Electro-Motive Diesel|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.<ref>http://www.dlw.indianrailways.gov.in/view_section.jsp?lang=0&id=0,295,329,389,391 {{Dead link|date=March 2022}}</ref> 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.<ref>{{Cite web|url = http://www.dlw.indianrailways.gov.in/view_section.jsp?lang=0&id=0,295,329,389,391|title = Details from production Factory}}</ref>

== Variants ==
[[File:KJM WDP4.jpg|left|thumb|KJM based WDP- 4 with KSR Bengaluru - Shivamogga Town Janshatabdi Express]]
[[File:ERS WDP4D 40103.jpg|thumb|ERS based wDp4d with [[Ernakulam-H.Nizamuddin Duronto Express]]]][[File:BGKT WDP4B.jpg|thumb|BGKT based WDP-4B no. 40031 with an express train]]

=== WDP-4 ===
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 BLW. 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, [[Indian locomotive class WDG-4|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.<ref>{{Cite book|url=https://rdso.indianrailways.gov.in/works/uploads/File/Introduction%20handbook%20on%20General%20Motor%20Diesel%20Locomotives.pdf|title=Introduction Handbook on GM Locomotive|publisher=IR CAMTECH|year=2006}}</ref>

==== Visibility Issue ====
The use of the locomotive with the long hood forward configuration has been criticised with respect to the driver's visibility as it is affected due to the protruding radiator section at the hood-end. This criticism has been rejected by the Railways.<ref>{{Cite web|title=Railway claims engine design not faulty|url=https://www.news18.com/news/india/ffgfx-report-rail-pro-reax-341832.html|date=2010-06-15|website=News18|access-date=2020-05-15}}</ref> However, in response, the cab profile of some WDP-4s were widened to increase the field of view from the control cab and the WDP-4B variant was also produced with the same widened cab profile.

=== WDP-4B ===
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. this Up-rated engine was designated as EMD 16N-710G3B-EC, with an RPM of 910 at Notch-8. 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 {{Convert|20.2|t|LT ST|abbr=}}. 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.<ref>{{Cite book|url=https://rdso.indianrailways.gov.in/works/uploads/File/WDP4B%20(MP-MISC-293-OCT-2014).pdf|title=RDSO diagram book for WDP-4B|publisher=Railway Design and Standards Organisation|year=2014|pages=5}}</ref>

=== WDP-4D ===
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-pneumatic microprocessor based control adapted from the WDP-4B and brake system equipment of KNORR/NYAB CCB type. This loco again with Dual-Cab, but with More Power and Better Fuel Consumption compared to ALCo DL560C, along with an Air Conditioned Hood Cab, became a very efficient replacement of [[WDP-3A]]<ref>{{Cite book|url=https://rdso.indianrailways.gov.in/works/uploads/File/WDP4D%20(MP-Misc-316)%20(Rev-00)%20SEPT-2016%20(WDP4D%204500%20HP).pdf|title=WDP4D diagram book|publisher=Railway Design and Standards Organisation|year=2016|pages=12}}</ref>

==Builders==
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.<ref>{{Cite web|url = http://www.dlw.indianrailways.gov.in/view_section.jsp?lang=0&id=0,295,329,389,391|title = DLW site}}</ref> Additional components are acquired through tenders and a bidding process.

== Locomotive sheds ==
{| class="wikitable sortable"
!Zone
!Name
!Shed Code
!Quantity
|-
| rowspan="2" |[[Central Railway zone|Central Railway]]
|Pune
|PA
|36
|-
|[[Kalyan railway station|Kalyan]]
|KYN
|14
|-
| rowspan="2" |[[Eastern Railway zone|Eastern Railway]]
|[[Howrah railway station|Howrah]]
|HWH
|16
|-
|[[Andal railway station|Andal]]
|UDL
|2
|-
| rowspan="3" |[[Northern Railway zone|Northern Railway]]
|[[Tughlakabad railway station|Tughlakabad]]
|TKD
|38
|-
|[[Ludhiana Junction railway station|Ludhiana]]
|LDH
|32
|-
|[[Lucknow Charbagh railway station|Lucknow]]
|LKO
|14
|-
|[[North Central Railway zone|North Central Railway]]
|[[Jhansi Junction railway station|Jhansi]]
|JHS
|14
|-
|[[North Eastern Railway zone|North Eastern Railway]]
|[[Izzatnagar railway station|Izzatnagar]]
|IZN
|35
|-
| rowspan="2" |[[Northeast Frontier Railway zone|Northeast Frontier Railway]]
|[[Guwahati railway station|Guwahati]]
|NGC
|27
|-
|[[Siliguri Junction railway station|Siliguri]]
|SGUJ
|81
|-
|[[North Western Railway zone|North Western Railway]]
|[[Bhagat Ki Kothi railway station|Bhagat Ki Kothi]]
| BGKT
|81
|-
| rowspan="2" |[[Southern Railway zone|Southern Railway]]
|[[Diesel Loco Shed, Ernakulam|Ernakulam]]
|ERS
|15
|-
|[[Diesel Loco Shed, Golden Rock|Golden Rock]]
|GOC
|40
|-
|[[South Central Railway zone|South Central Railway]]
|[[Diesel Loco Shed, Gooty|Gooty]]
|GY
|40
|-
| rowspan="2" |[[South Western Railway zone|South Western Railway]]
|[[Diesel Loco Shed, Krishnarajapuram|Krishnarajapuram]]
|KJM
|111
|-
|[[Hubli railway station|Hubli]]
|UBL
|48
|-
|[[Western Railway zone|Western Railway]]
|[[Diesel Loco Shed, Sabarmati|Sabarmati]]
|SBT
|46
|-
| colspan="3" |'''Total Locomotives Active as of 01-12-2021'''<ref>{{Cite web|title=Railway Website Mechanical Department|url=http://www.indianrailways.gov.in/railwayboard/view_section.jsp?lang=0&id=0,1,304,366,541,710,717|access-date=16 May 2020}}</ref>
|710
|}


==WDAP-5 Dual Mode Locomotive==
{{Main|Indian locomotive class WDAP-5}}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==

*[[Indian locomotive class WDG-4]]
*[[List of diesel locomotives of India]]
*[[Indian Railways]]
*[[Rail transport in India]]

==References==
{{reflist}}

==External links==
{{commons category|EMD GT46PAC locomotives}}
*[http://www.emdiesels.com/emdweb/international/gt46pac.jsp EMD specification]
*[http://www.emdiesels.com/emdweb/international/indianews/autocarWDG4091009.pdf Autocar India has a detailed profile of the WDG-4 locomotive.]
*[http://www.irfca.org/faq/faq-loco2d.html#loco Diesel loco specification at IRFCA website]
*[http://www.rdso.indianrailways.gov.in/works/uploads/File/Spec-Twin-Cab-4500HP-publish%2025-Aug-11.pdf Detailed Specifications for the WDP4D]
*[http://www.rdso.indianrailways.gov.in/works/uploads/File/Spec-4500HP-2400.43_rev_04_corrted_final_%2026.09.pdf Detailed Specifications for the WDP4B]
*[http://trainweb.org/railworld/WDG5/EMD%20TMs.pdf Traction Motor Specifications and Model Numbers]

{{Broad gauge locomotives of India}}
{{EMD misc}}

[[Category:A1A-A1A locomotives]]
[[Category:Electro-Motive Diesel locomotives|GT46PAC]]
[[Category:Diesel-electric locomotives of India|P-4]]
[[Category:5 ft 6 in gauge locomotives]]
[[Category:Electro-Motive Division locomotives|G46TPAC]]
[[Category:C-C locomotives]]
[[Category:Co-Co locomotives]]

Indian locomotive class WDP-4 - Revision history

Janamkatha: added references