![](https://upload.wikimedia.org/wikipedia/commons/thumb/6/60/Thuileloco.jpg/220px-Thuileloco.jpg)
A 4-4-6, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with:
- four (4) leading wheels (at the front of the locomotive)
- four (4) driving wheels (2 axles) fixed in a rigid frame, and
- six (6) trailing wheels (normally mounted in a trailing truck).
The only example of this wheel arrangement was the Thuile locomotive.
Other equivalent classifications are:
- UIC classification: 2'B3' (also known as German classification
- Italian classification), and
- French classification: 223.
References[edit]
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction