page_title: Du Bousquet locomotive
section_title: Design
hierarchical_section_title: Du Bousquet locomotive / Design
caption_attribution_description: Line drawing of a du Bousquet locomotive
context_page_description: The du Bousquet locomotive was an unusual design of articulated steam locomotive invented by French locomotive designer Gaston du Bousquet.
  The design was a tank locomotive, carrying all its fuel and water on board the locomotive proper, and a compound locomotive. The boiler and superstructure were supported upon two swivelling trucks, in a manner similar to a Meyer locomotive.
context_section_description: The design largely overcame the problems the Meyer design had with poor sealing on the steam-pipe flexible joints by having the rear truck, bearing the high-pressure cylinders, mounted on a bearing that permitted only rotation and not any other axes of flexibility.  The steam connection, mounted in the center of this, could seal much more easily since it did not have to allow so much freedom of movement.  The front truck, with the low-pressure cylinders, allowed some degree of tilt as well as rotation, and had steam connections from the rear truck with swivelling and telescoping joints to allow freedom of movement.
  Also unlike the Meyer, the front set of water tanks were mounted to the moving truck and moved relative to the boiler, somewhat reminiscent of a Garratt locomotive.  The tanks above the rear truck, and the rear-mounted fuel bunker, were attached to the boiler and superstructure.
  The du Bousquet design had an unusual wheel arrangement; both trucks had six driving wheels and two carrying wheels supporting the cylinders.  Unlike many other articulated designs, these carrying wheels were toward the center of the locomotive, as were the cylinders.  This arrangement is expressed in the French classification as 031+130, in the Whyte notation as 0-6-2+2-6-0T, or in the UIC classification as (C1′)+(1′C) n4tv.
caption: Line drawing of the locomotive design.
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