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Good news. The models aren't out of scale. The Northerns came along pretty late in the development of steam power, and the great majority of them had large, long boilers. Northerns were intended on most roads to be dual-purpose engines (freight and passenger). High tractive effort permitted them to start heavy trains; their large drivers allowed high speeds for passenger or fast freight service. <br /> <br />Bear in mind the fact that mallets used steam twice--first in the high-pressure cylinders, and again in the low-pressure cylinders. <br /> <br />
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