Arnoux system

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Arnoux system is a railway device invented by Jean-Claude-Républicain Arnoux in 1838 and patented on 20 March 1838 under French patent number 8342. It is a system of articulation for rail vehicles. Arnoux was the chief engineer of the Ligne de Sceaux which was originally built with very tight bends in the area around Sceaux. Arnoux devised a new articulation system that allowed train wheels to turn, the "système ferroviaire dit Arnoux", and the line was to test his prototypes.


Diagram of Arnoux system

Other systems[edit]

Shortly after opening, the bogie was invented in the USA, rendering Arnoux's system pointlessly complicated. The Arnoux system bears some similarity to Cleminson's patent system. Both are designed to keep the axles radial to the curvature of the track.


The system was not suitable for locomotives so Arnoux invented a separate system for them. The locomotives were of 2-4-2 wheel arrangement and the driving wheels were flangeless. The carrying wheels were apparently arranged to pivot and were controlled by near-horizontal guide wheels.[1]


  1. ^ "The Arnoux Guide-Wheel System". 2013-09-12. Retrieved 2013-10-21.