Individual (engine)

Single is a type of Locomotive to vapor whose axles have the following configuration (from the front to the back):

1 carrying Axle
1 driving axle
1 carrying axle

What is written:

2-2-2 in Whyte coding.
111 in coding of Europe.

This configuration was current on the engines of the beginnings of the railroad like Buddicom, and length boiler standard Stephenson. It would have been adopted after the accident of the machines with two axles, caused by the rupture of the one of them.

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