Editing 0-4-4-0 (section)

=== Mallet locomotives ===
[[File:Mallet 101 POC Noyelles.jpg|thumb|0-4-4-0T {{track gauge|metre gauge|lk=on|disp=1}} Mallet of the [[PO Corrèze]]]]
{{further|Mallet locomotive}}

The most numerous 0-4-4-0 locomotives were the [[Mallet locomotive|Mallet]] design. These are [[articulated locomotive|articulated]] [[compound locomotive]]s. The rear wheels and cylinders were fixed to the frames, as for a conventional locomotive. The front set formed a bogie that was pivoted at its rear and supported the front of the boiler on a sliding pad. As a compound, the lower pressure cylinders were always the swivelling bogie, as this only required the lower intermediate pressure to be passed through the pivoting steam pipe. The first of these was for a {{track gauge|600 mm|lk=on|disp=1}} [[Decauville]] light railway in 1887. Like the Fairlies, these were intended for narrow gauge lines built with tight curves.{{sfnp|Riemsdijk|1994|pages=42-44}} The most numerous 0-4-4-0T and 0-4-4-0[[tender-tank locomotive|TT]] Mallets were small locomotives of 600&nbsp;mm and {{track gauge|750 mm|lk=on|disp=1}} gauge built for the [[Java]]n sugar plantations in the 1900s and 1910s by companies like [[Orenstein & Koppel]] and the Dutch [[Du Croo & Brauns]],{{sfnp|Bruin|1987}} some of which were still operating into the 21st century.{{sfnp|Joy|2012|pages=50–51}}

[[File:4601D2x22SBBCFFFFSi.jpg|thumb|Swiss Central {{interlanguage link|SCB D 2×2/2{{!}}D 2×2/2|de|SCB D 2×2/2}} tender Mallet]]
Switzerland persisted with the 0-4-4-0T and 0-4-4-0 types and in the 1890s [[Maffei (company)|J.A. Maffei]] built classes of each for the [[standard gauge]] [[Swiss Central Railway]].{{sfnp|Riemsdijk|1994|page=44}}

The Mallet type developed and outgrew the original wheel arrangement, particularly in the US, also gaining tenders and often being simple expansion engines rather than compounds.{{sfnp|Riemsdijk|1994|pages=42-46}}

{{Clear}}