The Bengal Nagpur Railway class NM was a class of ten 4-8-0+0-8-4 Garratt locootives. This was modified N class Garratt. 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.
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