Tags: Locomotive.

The Norfolk and Western Railway’s M M1 and M2 classes (also known as the Mastodon-class) were a series of 4-8-0 steam locomotives owned and operated by the Norfolk and Western Railway. These were the last significant deliveries of 4-8-0s in the United States. The N&W needed to get coal shipments over a mountain range and powerful locomotives were needed. 4-8-0s were chosen over 2-8-2s because the 4-8-0 had better adhesive weight.

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