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{{Infobox locomotive
| name = Indian locomotive class YM
| image = YM 5757 at Secunderabad 1976.jpg
| caption = YM 5757 at Secunderabad, 1976
| powertype = Steam
| builder = [[Nippon Sharyo]]
| builddate = 1956
| totalproduction = 12
| whytetype = {{whyte|2-6-4|T}}
| gauge = {{track gauge|1000 mm}}
| coupleddiameter = {{convert|1219|mm|ftin|abbr=on}}
| axleload = {{convert|9|t|abbr=on}}
| weightondrivers = {{convert|27|t|abbr=on}}
| serviceweight = {{convert|53.5|t|abbr=on}}
| firearea = {{convert|1.11|m2|sqft|abbr=on}}
| boilerpressure = {{convert|14.5|bar|psi|abbr=on}}
| totalsurface = {{convert|51.75|m2|sqft|abbr=on}}
| cylindercount = Two, outside
| cylindersize = {{convert|330|x|560|mm|in|abbr=on}}
| operator = [[Indian Railways]]
| fleetnumbers = Pre-1957: 6001–6012<br>Post-1957: 5750–5761
| notes = <ref>{{Cite web |url=https://jdhsmith.math.iastate.edu/term/slinigr.htm |title=Indian Government Railways steam locomotives |last=Smith |first=Jonathan |date=2009 |website=The terminal: Standard steam locomotives |publisher=[[Iowa State University]] |access-date=30 November 2024 |quote=}}</ref>{{sfn|Hughes|1977|page=24}}{{sfn|Hughes|1977|page=92}}
}}

The Indian locomotive '''class YM''' were {{whyte|2-6-4|T}} tank locomotives built for [[Indian Railways]]' [[Metre-gauge railway|metre-gauge]] network, as one of the post-[[Partition of India|partition]] designs evolved from the Indian Railway Standard locomotives.

== History ==
In 1954, the Indian Railways ordered twelve tank locomotives from [[Nippon Sharyo]] for use on suburban trains,<ref>{{Cite report |title=Report by the Railway Board of Indian Railways 1954-55 |date=1955 |publisher=Indian Railway Board |issue=1|page=59}}</ref> and were delivered in 1956 to the [[Central Railway zone]]. Three examples initially went to the [[Southern Railway zone]], but were soon transferred to [[Lallaguda]] depot of Central Railways, near [[Secunderabad]]. The YM class were mainly used to haul trains on the line between [[Bolarum]] via Secunderabad to [[Hyderabad]].{{Sfn|Hughes|1977|p=27}}

With the formation of the [[South Central Railway zone]] and the associated reorganization of the surrounding regional zones in October 1966, all 12 members went to the South Central Railways, where they were in service as of 1975.<ref>{{cite web|access-date=31 January 2024 |title=History of the Railway Zones |url=https://www.irfca.org/faq/faq-geog.html#history |website=IRFCA website |publisher= Indian Railways Fan Club (IRFCA)}}</ref>{{Sfn|Hughes|1977|p=27}}

Technically, the YM class were similar to the [[5 ft 6 in gauge railway|broad-gauge]] [[Indian locomotive class WM|WM class]], although the former is smaller than the latter.{{Sfn|Hughes|1977|p=23}}

== Proposed variants ==
Indian Railways drew up plans for the Class YS {{whyte|2-10-6|T}} heavy tank locomotive.{{Sfn|Atkins|1999|p=82}}{{Sfn|Hughes|1979|p=23}}{{Failed verification|date=November 2024}} In 1957, however, these plans were dropped, in favour of a larger, heavier version of the YM class, with an axle load of 10.5 tons and a service weight of 73 tons. A requirement of 89 locomotives was determined for both suburban and shunting duties. However, in light of both [[dieselisation]] and [[electrification]], the plan ultimately never came to fruition, and surplus [[Indian locomotive class YL|class YL]] locomotives were deployed for these roles.<ref>{{Cite report |url=https://archive.org/details/dli.csl.1651/mode/1up |title=Report of the Thirty-Seventh Meeting of the Locomotive Standards Committee March |date=1957 |publisher=[[Ministry of Railways (India)|Ministry of Railways]] |location=[[New Delhi]] |page=15}}</ref>{{Sfn|Hughes|1979|p=23}}

== References ==
<references />
== Bibliography ==
* {{Cite book |last=Hughes |first=Hugh |title=Steam Locomotives in India, Part 2 – Metre Gauge |publisher=The Continental Railway Circle |year=1977 |isbn=0-9503469-3-4}}
* {{Cite book |last=Hughes |first=Hugh |url=https://archive.org/details/steamlocomotives0000hugh/mode/2up |title=Steam Locomotives of India, Part 3 – Broad Gauge |publisher=The Continental Railway Circle |year=1979 |isbn=0-9503469-4-2 |url-access=registration}}
* {{Cite book |last=Atkins |first=Philip |title=Dropping the Fire - The Decline and Fall of the Steam Locomotive |publisher=Irwell Press |year=1999 |isbn=1-871608-89-9}}
== External links ==

* [https://www.world-railways.co.uk/general-photo-087 Indian Railways (SCR) metre gauge class YM 5757 at Lalaguda]
{{commonscat|Indian locomotive class YM}}

{{Metre gauge locomotives of India}}
[[Category:2-6-4T locomotives]]
[[Category:1′C2′ locomotives]]
[[Category:Nippon Sharyo locomotives]]
[[Category:Steam locomotives of India|YM]]
[[Category:Railway locomotives introduced in 1956]]
[[Category:Metre-gauge steam locomotives]]

Indian locomotive class YM - Revision history

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