Triplex

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Under the Whyte notation for the classification of steam locomotives, a 2-8-8-8-2 has two leading wheels, three 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 third set of drivers is located under the tender. All of the examples produced were a Triplex of the Mallet type.

Under the Whyte notation for the classification of steam locomotives, a 2-8-8-8-4 has two leading wheels, three sets of eight driving wheels, and four trailing wheels.

R16 (New York City Subway car) class of New York City Subway car

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D-type Triplex (New York City Subway car) class of New York City subway cars

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Triplex (locomotive) steam locomotive

A Triplex locomotive is a steam locomotive that divides the driving force on its wheels by using three pairs of cylinders rigidly mounted to a single locomotive frame. Inevitably any such locomotive will be articulated. All the examples that have been produced have been of the Mallet type but with one extra set of driving wheels under the tender.

Gangway connection flexible connector fitted to the end of a railway coach, enabling passengers to move from one coach to another

A gangway connection is a flexible connector fitted to the end of a railway coach, enabling passengers to move from one coach to another without danger of falling from the train.

A Rail Adhesion Car or Rail Adhesion Train is a modified vehicle used on rail adhesion system where the normal equipment does not have the rail sanding ability of locomotives. In particular, it may involve tanks and dispensing equipment installed in an electric subway or rail car that is run over the rails alone or in a train to dispense sand when needed. Because of limits of space under the cars the tanks of sand or gel/sand mix are installed inside the passenger space.

MPI MP8AC-3 class of work train locomotive for the Nedw York City Subway

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