2-8-8-8-8-2 2-8-8-8-8-2 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'). In June 1914, George R. Henderson
1/2 + 1/4 + 1/8 + 1/16 + ⋯ 1/2 + 1/4 + 1/8 + 1/16 + ⋯ In mathematics, the infinite series is an elementary example of a geometric series that converges absolutely. There are many different expressions that can be shown to be equivalent to the problem, such as the form: 2 + 2 + 2 + ... The sum of this series can be denoted in summation notation as: As with any infinite series, the infinite sum is defined to mean the limit of the sum of the first terms as approaches infinity. Multiplying by 2 reveals a useful relationship: Subtracting from both sides, As approaches