>Abdullah8031 at 06:27, 5 July 2021

2021-07-05T06:27:14Z

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{{Infobox locomotive
| name = Indian locomotive class YDM-1
| image = File:Indian diesel locomotive, class YDM1R, Nº 6002.jpg
| alt =
| caption = A YDM-1 class locomotive no 6002 preserved at National Rail Museum, New Delhi
| powertype =Diesel
| designer = [[North British Locomotive Company]] (NBL)
| builder = [[North British Locomotive Company]] (NBL)
| ordernumber = PR/4574/S/4910/52
| serialnumber =
| buildmodel =
| builddate = 1952
| totalproduction = 20
| rebuilder = [[Chittaranjan Locomotive Works|CLW]]
| rebuilddate = 1974-1976
| numberrebuilt = 20
| aarwheels = B'-B'
| uicclass = B-B
| Britishclass = [[Bo-Bo]]
| gauge = {{RailGauge|1000mm|allk=on}}
| bogies =
| wheeldiameter = {{convert|804|mm|in|2|abbr=on}}
| minimumcurve =
| wheelbase = {{convert|2134|mm|in|2|abbr=on}}
| engine total = 1
| length =
| over couplers = {{convert|12.020|m|ftin|abbr=on|frac=8}}
| over bufferbeams=
| body = {{convert|10.630|m|ftin|abbr=on|frac=8}}
| width = {{convert|2743|mm|ftin|frac=8|abbr=on}}
| height = {{convert|3421|mm|ftin|frac=8|abbr=on}}
| axleload = {{convert|11000|kg|abbr=on}}
| locoweight = {{convert|43680|kg|abbr=on}}
| fueltype = [[Diesel fuel|Diesel]]
| fuelcap = {{convert|3724|L|abbr=on}}
| lubecap = {{convert|200|L|abbr=on}}
| coolantcap = {{convert|204|L|abbr=on}}
| watercap =
| sandcap = {{convert|0.35|L|abbr=on}}
| powersupply = 110 V DC supply
| consumption =
| watercons =
| primemover = Earlier Paxman V12 RPHXL II, 625/580hp replaced by Mak/CLW L6 6M 282 A(K), 700hp
| rpmrange =
| rpmrange low = 525
| rpmrange idle = 525
| rpmrange max = 1250
| enginetype = 12RPHXL/II
| aspiration = [[Turbo-supercharger|Turbo-supercharged]]
| displacement =
| alternator = Boom Wade N5
| generator = C.A.V D3-9
| tractionmotors =
| t/m amps 1 hr =
| t/m amps cont =
| headendpower = 110 V DC
| cylindercount = 12
| cylindersize =
| transmission = Voith hydraulic with Cardan shaft drive to bogies
| gear ratio =
| multipleworking = 2
| locobrakes = [[Railway air brake|Air brake]], hand brakes,
| dynamicpeakeffort=
| locobrakeforce =
| trainbrakes = [[Vacuum brake]]
| reservoircap =
| compressorcap = {{convert|494|L|abbr=on}}
| exhaustercap = {{convert|852|L|abbr=on}}
| coupling =
| maxspeed = {{convert|83|km/h|0|abbr=on}}
| poweroutput = Earlier Paxman V12 RPHXL II {{convert|580|HP|abbr=on}} replaced by Mak/CLW L6 6M 282 A(K) {{convert|700|HP|abbr=on}}
| poweroutput start=
| poweroutput 1 hr=
| poweroutput cont=
| tractiveeffort =
| t/e starting = {{convert|10.320|t|0|abbr=on}}
| t/e 1 hr =
| t/e continuous = {{convert|08.230|t|0|abbr=on}}
| factorofadhesion =
| f/adh starting =
| f/adh 1 hr =
| f/adh continuous=
| safety =
| operator = [[Indian Railways]]
| operatorclass = Earlier 'DY' class
| fleetnumbers = 6000-6019
| officialname =
| nicknames =
| locale = [[ Western Railway zone]]
| deliverydate =
| firstrundate = 1955-56
| lastrundate = 1995
| retiredate = 1995
| withdrawndate = 1990s
| preservedunits = 3(6002, 6008, 6015)
| restoredate =
| scrapdate = 2000s
| currentowner = NRM, ICF resume
| disposition = All except 3 scrapped
| notes =
}}
The Indian locomotive class '''YDM-1''' is a class of [[Diesel-hydraulic|diesel-Hydraulic]] locomotive that was developed in 1954 by [[North British Locomotive Company]] (NBL) for [[Indian Railways]]. The model name stands for [[Metre-gauge railway|Metre gauge]] (Y), Diesel (D), Mixed traffic (M) engine, 1st generation (1). They entered service in 1955. A total of 20 YDM-1 locomotives was built between 1954 and 1956, which made them among the first MG main-line diesels.

The YDM-1 served both passenger and freight trains for over 46 years. As of January 2020, all 20 locomotives have been withdrawn from service with 3 locomotives being preserved at various location around India.

== History ==
These locomotives originally called 'DY' class was imported from [[North British Locomotive Company]] (NBL) to haul goods and passenger rakes in Western Railways particularly around [[Gandhidham Junction railway station|Gandhidham]] due to of scarcity of water for steam locomotives. These are among the first Metre Gauge main-line diesels locomotives of India.

The YDM-1 class locomotives are the survivors from the second batch of North British diesel locos supplied in 1955.They were homed at a specifically made Diesel shed in Gandhidham. [[Chittaranjan Locomotive Works|CLW]] replaced the engines on these with Maybach engines around 1975. Western Railways phased these locos out in the end of the 1990s [12/99] from mainline service and As shunter in [[Ajmer Junction railway station|Ajmer]] on 15.02.2001. The loco ( numbered 6002) came at NRM from Wankaner in August 2003 after renovation at Ajmer Loco Workshop.

== Specification ==
[[File:Indian locomotive class YDM-1.jpg|thumb|350px|A YDM-1 hauling an inspection special]]
{| class="wikitable"
|+
|Original No
|No 3001 to 3020
|-
|Maker's Name & No
|North British; Locomotive Co. Glasgow, UK, 27507
|-
|Builders
|North British Locomotive
|-
|Engine
|Paxman V12 RPHXL II, 625/580hp replaced by Mak/CLW L6 6M 282 A(K), 700hp
|-
|Transmission
|Voith hydraulic with Cardan shaft drive to bogies
|-
|Year Built
|1954
|-
|Gear Box
|David Brown, UK
|-
|Wheel Arrangement
|B-B
|-
|Hauling Power
|10,977 kg
|-
|Tare Weight
|42 Tonnes
|-
|Gauge
|1 Metre
|-
|Cost
|Rs. 4,85,209/- (Capital Head)
|-
|Remarks
|Fitted with Automatic, Vacuum & Air Brake System
|-
|First Trip
|From Gandhi Dham to Palanpur
|-
|Last Service
|worked for Kandla Port and Naliya etc.
|}

== Preserved Examples==
A total of three YDM-1 locomotives have been preserved all over India. <ref>{{Cite web|url=http://www.indianrailways.gov.in/railwayboard/view_section.jsp?lang=0&id=0,1,304,366,1706|title=Ministry of Railways (Railway Board)|website=www.indianrailways.gov.in|access-date=2020-04-14}}</ref><ref>{{Cite web|url=https://drive.google.com/drive/folders/1L7PMD3GYsSQibjrOjIk9dpekeDi7Gp9u|title=preserve loco list}}</ref>
{| class="wikitable"
!Class
!Manufacturer
!Loco Number
!Previous shed
!Name
!LIvery
!Location
!ref
|-
|YDM-1
|NBL
|6002
|Gandhidham
|
|Orange with twin black stripes
|plinthed at [[National Rail Museum, New Delhi|National Railway Museum, Delhi]] (NRM)
|<ref>https://www.irfca.org/apps/locos/show/217?list_type=preserved</ref>
|-
|YDM-1R
|NBL
|6008
|Gandhidham
|
|Light blue/red/dark blue
|Preserved at Regional Rail Museum, Chennai.
|<ref>https://www.irfca.org/apps/locos/show/223?list_type=preserved</ref>
|-
|YDM-1
|NBL
|6012
|Gandhidham
|
|Navy blue with yellow stripe
|Preserved at Regional Rail Museum, Chennai.
|<ref>https://www.irfca.org/apps/locos/show/230?list_type=preserved</ref>
|-

|}
== Former shed ==

* [[Gandhidham Junction railway station|Gandhidham]] (GIM): All the locomotives of this class has been withdrawn from service.

==See also==

*[[History of rail transport in India]]
*[[Indian Railways]]
*[[Locomotives of India]]
*[[Rail transport in India]]

==References==
{{reflist}}

==External links==
{{commons category|Indian locomotive class YDM1}}
*http://www.irfca.org/faq/faq-specs.html#YDM-1
*[http://www.irfca.org/faq/faq-loco2e.html]
*[http://www.irfca.org India railway fan club]
{{Metre gauge locomotives of India|state=expanded}}

[[Category:Diesel-hydraulic locomotives of India]]
[[Category:B-B locomotives]]
[[Category:NBL locomotives]]
[[Category:Railway locomotives introduced in 1955]]
[[Category:Metre gauge locomotives]]

Indian locomotive class YDM-1 - Revision history

>Abdullah8031 at 06:27, 5 July 2021