The Norfolk and Western M2's, built in 1910 by the Baldwin Locomotive Works, where the last and heaviest 4-8-0s in the US. The M2 was the successor to the Class M and M1 and sported a larger boiler and improved walschaerts valve gear. Although more powerful than the M's, the M2s were notoriously poor steamers due to their smaller fireboxes and rode extremely rough. Regardless of their short-comings, the M2s would survive through to the late 50's as they where the heaviest non-articulated freight locomotives ever built for the N&W and where seen primarily on heavy ore drags.
Cooperation with Greencoast Studios, model by Dennis. Available for purchase on the Greencoast Studios store.
TRS19 & T:ANE Version Bundle: http://x-z.eu/GCSNWM2bu
T:ANE Version: http://x-z.eu/GCSWMM2ta
TRS19 Version: http://x-z.eu/GCSWMM219