Qué (quién) es 0-4-0 4 - definición

LOCOMOTIVE WHEEL ARRANGEMENT

0-4-0+0-4-0T

0-4-0

Under the Whyte notation for the classification of steam locomotives, represents one of the simplest possible types, that with two axles and four coupled wheels, all of which are driven. The wheels on the earliest four-coupled locomotives were connected by a single gear wheel, but from 1825 the wheels were usually connected with coupling rods to form a single driven set.

https://en.wikipedia.org/wiki/0-4-0

0-4-4T

TANK LOCOMOTIVE WHEEL ARRANGEMENT

0-2-2 (russian); 0-4-4; 0-4-4BT

Under the Whyte notation for the classification of steam locomotives, 0-4-4 represents the wheel arrangement of no leading wheels, four powered and coupled driving wheels on two axles, and four trailing wheels on two axles. This type was only used for tank locomotives.

https://en.wikipedia.org/wiki/0-4-4T

0-4-0+4

Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of no leading wheels, four powered and coupled driving wheels on two axles and four trailing wheels on two axles mounted in a bogie.

https://en.wikipedia.org/wiki/0-4-0+4

Wikipedia

0-4-0+0-4-0

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, the 0-4-0+0-4-0 is an articulated locomotive of the Garratt type. The wheel arrangement is effectively two 0-4-0 locomotives operating back-to-back or face-to-face, with the boiler and cab suspended between the two power units. Each power unit has no leading wheels, four powered and coupled driving wheels on two axles and no trailing wheels. A similar arrangement exists for Mallet and Meyer locomotives, but is referred to as 0-4-4-0.

https://en.wikipedia.org/wiki/0-4-0+0-4-0