Mason Bogie locomotives are a type of articulated tank locomotive suited for sharp curves and uneven track, once commonly used on narrow-gauge railways in the United States. The design is a development of the Single Fairlie locomotive.
The Wm. Mason, an 1874 0-6-6 Mason Bogie and the first locomotive with Walschaerts valve gear built in the United States. Note the intricate decorative work.
Boston, Revere Beach & Lynn #6, an 1886 product of Mason Machine Works. This is a 2-4-4 Mason Bogie. Note the deep firebox permitted by this configuration, and the high reversing shaft (below the bell) with a long lifting link to the valve gear radius rod.
Torch Lake at Greenfield Village
A Fairlie locomotive is a type of articulated steam locomotive that has the driving wheels on bogies. The locomotive may be double-ended or single ended.
David Lloyd George of the Ffestiniog Railway
Fairlie locomotive with two separate boilers built for Burma Railways by the Vulcan Foundry
Double Fairlie Merddyn Emrys at Porthmadog
David Lloyd George built in 1992 for the Ffestiniog Railway