The critical speed of railway rolling is the threshold beyond which a railway vehicle moves from regular gear to an unstable state.

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An important limitation to the speed rise of railway rolling stock is represented by oscillating motions that are not sufficiently dampened and are set up in some mechanical organs above a certain speed, creating harmful situations for both the track and the vehicle itself .

Oscillatory phenomena that determine the condition of instability generally occur with an accentuated serpentine motion, accompanied by important side shifts of the carriage that cause wheel rim bumps against the rail.

A vehicle is said to be in a state of instability when the aforementioned phenomena occur in a very net way; the speed that represents the threshold between regular gear and gear under unstable conditions takes the name of critical speed. Notemodify wikitesto Bibliografiamodifica wikitesto Voices correlateemodify wikitesto

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