Английская Википедия:2-8-8-8-8-2

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Under the Whyte notation for the classification of steam locomotives, a 2-8-8-8-8-2 has two leading wheels, four sets of eight driving wheels, and two trailing wheels. Because of its length, such a locomotive must be an articulated locomotive. It is not longer than a normal articulated; the fourth set of drivers is located under the tender.

Other equivalent classifications are:
UIC classification: 1-D-D-D-D-1 (also known as German classification and Italian classification)
AAR classification: 1-D-D-D-D-1
French classification: 140+040+040+041
Turkish classification: 45+44+44+45
Swiss classification: 4/5+4/4+4/4+4/5

The equivalent UIC classification is to be refined to (1'D)DD(D1').

History

In June 1914, George R. Henderson was granted US Patent 1,100,563 for a quadruplex locomotive, which was assigned to the Baldwin Locomotive Company. Baldwin submitted a design for a 2-8-8-8-8-2 quadruplex to the Atchison, Topeka, and Santa Fe Railway.

The proposed quadruplex locomotive incorporated elements of the Southern Pacific's cab-forward locomotives, the triplex locomotives built for the Erie and Virginian, the jointed boiler locomotives built for the Santa Fe, and the Mallet locomotives. It had a front cab for the engineer and a rear cab for the fireman. There were four drive wheel sets, three of which were fitted under the articulated boiler and the fourth under the tender. The drive wheels were fitted with either high or low pressure cylinders, as on a Mallet locomotive. It was a compound locomotive with the front boiler feeding the front drive wheel set fitted with high pressure cylinders and its exhaust feeding the second drive wheel set fitted with low pressure cylinders. The rear boiler fed the third set of drive wheels with high pressure cylinders and its exhaust fed the fourth set of drive wheels under the tender fitted with low-pressure cylinders. The exhaust from both sets with low-pressure cylinders was vented to the atmosphere, and the draft for the firebox would have been provided by a fan.