This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help by introducing citations to additional sources. Find sources: – ···scholar·JSTOR(January 2015)
The Bengal Nagpur Railway class NM was a class of ten 4-8-0+0-8-4Garratt locomotives. This was modified N classGarratt. It had Thermic siphon and arch tubes for better performance. It worked on the Bilaspur-Katni line and Anuppur-Chirmiri branch line for hauling coal. Probably because of Poppet valves, they retired early.[1]